Server API reference
A server API reference for NightWatchman Enterprise.
Authorization services
Authorization services methods are available for use once an instance of the Web WakeUp API class has been created. The two ways of using the Web WakeUp API are:
Creating a service reference
In Microsoft Visual Studio you can add a service reference to the web service URL:
http://localhost/WebWakeUp/WebServices/AuthorisationServices.asmx
This generates a proxy class, typically with the name AuthorisationServicesSoapClient. In code, the proxy class can then be used to access the Web WakeUp Authorization API methods. For example, the following code fragment shows the GetAuthorisedMachines method being invoked. You must call client.Close() after use.
var client = new assc.AuthorisationServicesSoapClient();
try
{
var resultArr = client.GetAuthorisedMachines("ACME\Joe");
//do what you want to do with the results array.
}
catch(Exception ex)
{
//handle the error case
}
finally
{
client.Close(); //MUST CALL THIS
}
The code must call the client.Close() method after use.
Creating a web reference
In Microsoft Visual Studio there is an advanced option of the service reference called a web reference. For Web WakeUp you can add a web reference to the web service URL:
http://host/WebServices/AuthorisationServices.asmx
This generates a proxy web service class, typically with the name AuthorisationServicesWse. In code the class can then be used to access the Web WakeUp API methods.
For example, the following code fragment shows a reference to AuthorisationServices.asmx that has been created with the name assc and the GetAuthorisedMachines method being invoked on the new soap client that is created via the reference:
var client = new assc.AuthorisationServicesSoapClient();
String[] result = client.GetAuthorisedMachines("ACME\Joe");
finally
{
client.Close(); //MUST CALL THIS
}
As Web WakeUp uses windows authorization, the basic HTTP binding in the application's app.config file will also need the following security settings added:
...
<security mode="TransportCredentialOnly">
<transport clientCredentialType="Ntlm"/>
</security>
...
The following authorization services methods are available:
AddAuthorisedMachine
bool AddAuthorisedMachine(string UserName, string MachineName)
Purpose
Adds a machine to a user's authorized list of machines.
Inputs
-
UserName: The user name for an authorized user in the format DomainName\UserName
-
MachineName: The name for the computer to be added in the format DomainName\MachineName
Returns
-
Boolean: Success or failure.
Example
C#
var client = new assc.AuthorisationServicesSoapClient();
try
{
var result = client.AddAuthorisedMachine("ACME\Joe",
“ACME\ACMEdvwks0012”);
if (result)
Console.write("added ACMEdvwks0012 for Joe");
else
Console.write("could not add ACMEdvwks0012");
}
catch(Exception ex)
{
//handle the error case
}
finally
{
client.Close(); //MUST CALL THIS
}
DeleteAuthorisedMachine
bool DeleteAuthorisedMachine(string UserName, string MachineName)
Purpose
Deletes a machine from a user's authorized list of machines using its name.
Inputs
-
UserName: The user name for an authorized user in the format DomainName\UserName
-
MachineName: The name for the computer to be added in the format DomainName\MachineName
Returns
-
Boolean: Success or failure.
Example
C#
var client = new assc.AuthorisationServicesSoapClient();
try
{
var result = client.DeleteAuthorisedMachine("ACME\Joe",
“ACME\ACMEdvwks0012”);
if (result)
Console.write("removed ACMEdvwks0012 from Joe");
else
Console.write("could not remove ACMEdvwks0012");
}
catch(Exception ex)
{
//handle the error case
}
finally
{
client.Close(); //MUST CALL THIS
}
GetAuthorisedMachines
String[] GetAuthorisedMachines(string UserName)
Purpose
Gets an array of machine names on a user's authorized list of machines.
Inputs
-
UserName: The user name for an authorized user, in the format DomainName\UserName
Returns
-
A string array containing all the machines the user is authorized to wake up.
Example
C#
var client = new assc.AuthorisationServicesSoapClient();
try
{
var result = client.GetAuthorisedMachines( "ACME\Joe”);
//process results array
}
catch(Exception ex)
{
//handle the error case
}
finally
{
client.Close(); //MUST CALL THIS
}
UpdateAuthorisedMachine
bool UpdateAuthorisedMachine(string UserName, string MachineName, string OldMachineName)
Purpose
Updates the name of a currently authorized machine for a user.
Inputs
-
UserName: The user name for an authorized user, in the format DomainName\UserName
-
MachineName: The new name for the machine being updated, in the format DomainName\MachineName
-
OldMachineName: The old name for the machine being updated, in the format DomainName\MachineName
Returns
-
Boolean: Success or failure.
Example
C#
var client = new assc.AuthorisationServicesSoapClient();
try
{
var result = client.UpdateAuthorisedMachine( "ACME\Joe",
“ACME\ACMEdvwks0012”,
"ACME\ACMEdvwks0017”);
if (result)
Console.write("updated ACMEdvwks0012");
else
Console.write("could not update ACMEdvwks0012");
}
catch(Exception ex)
{
//handle the error case
}
finally
{
client.Close(); //MUST CALL THIS
}
Local services
Web WakeUp provides an interface containing functions that allow you to find and wake a named computer to check its current status. The information provided here is for advanced users with a prerequisite knowledge of web service development.
You can open the authorisationservices.asmx and localservices.asmx pages from a web browser but only if you are logged on and browsing from the server where the pages are hosted.
Local services methods are available for use once an instance of the Web WakeUp API class has been created. The two ways of using the Web WakeUp API are:
Creating a service reference
In Microsoft Visual Studio, you can add a service reference to the web service URL:
http://host/WebWakeUp/WebServices/LocalServices.asmx
This generates a proxy class, typically with the name LocalServicesSoapClient. In code, the proxy class can be used to access Web WakeUp API methods. For example, the following code fragment illustrates the FindMachines method being invoked.
var client = new lssc.LocalServicesSoapClient();
try
{
var resultArr = client.FindMachines(“MachineName”);
//do what you want to do with the results array.
}
catch(Exception ex)
{
//handle the error case
}
finally
{
client.Close(); //MUST CALL THIS
}
You must call client.Close() after use
Creating a web reference
In Microsoft Visual Studio, there is an advanced option of the service reference called a web reference. For Web WakeUp you can add a web reference to the web service URL.
http://host/WebServices/LocalServices.asmx
This generates a proxy class to the web service, typically with name LocalServicesWse. In code, the class can then be used to access Web WakeUp API methods. For example, the following code fragment shows a reference to LocalServices.asmx that has been created with the name lssc and the FindMachines method being invoked on the new soap client that is created via the reference:
var client = new lssc.LocalServicesSoapClient();
String[] result = client.FindMachines(“MachineName”);
finally
{
client.Close(); //MUST CALL THIS
}
As Web WakeUp uses windows authorization, the basic HTTP binding in the application's app.config file will also need the following security settings added:
...
<security mode="TransportCredentialOnly">
<transport clientCredentialType="Ntlm"/>
</security>
...
The following methods are available in the Web WakeUp API.
AddRegisteredMachine
bool AddRegisteredMachine(string UserName, string MachineName)
Purpose
Adds a computer to a user's list of registered computers
Inputs
-
UserName: The user name for an authorized user in the format DomainName\UserName
-
MachineName: The name for the computer to be added in the format DomainName\MachineName
Returns
-
Boolean: Success or failure.
Example
C#
var client = new lssc.LocalServicesSoapClient();
try
{
var result = client.AddRegisteredMachine( "ACME\Joe",
“ACME\ACMEdvwks0012”);
if (result)
Console.write("added ACMEdvwks0012 for Joe");
else
Console.write("could not add ACMEdvwks0012");
}
catch(Exception ex)
{
//handle the error case
}
finally
{
client.Close(); //MUST CALL THIS
}
ClearRegisteredMachine
bool ClearRegisteredMachine(string UserName)
Purpose
Clears the default computer registered to a user.
Inputs
-
UserName: The user name for an authorized user in the format DomainName\UserName
Returns
-
Boolean: Success or failure.
Example
C#
var client = new lssc.LocalServicesSoapClient();
try
{
var result = client.ClearRegisteredMachine( "ACME\Joe");
if (result)
Console.write("registered computer cleared");
else
Console.write("could not clear computer");
}
catch(Exception ex)
{
//handle the error case
}
finally
{
client.Close(); //MUST CALL THIS
}
DeleteRegisteredMachine
bool DeleteRegisteredMachine(string UserName, string MachineName)
Purpose
Deletes a computer from a user's list of registered computers using its name.
Inputs
-
UserName: The user name for an authorized user in the format DomainName\UserName
-
MachineName: The name for the computer to be added in the format DomainName\MachineName
Returns
-
Boolean: Success or failure.
Example
C#
var client = new lssc.LocalServicesSoapClient();
try
{
var result = client.DeleteRegisteredMachine("ACME\Joe",
“ACME\ACMEdvwks0012”);
if (result)
Console.write("removed ACMEdvwks0012 from Joe");
else
Console.write("could not remove ACMEdvwks0012");
}
catch(Exception ex)
{
//handle the error case
}
finally
{
client.Close(); //MUST CALL THIS
}
FindMachineExact
bool FindMachineExact(string MachineName)
Purpose
Finds a computer using its exact netBIOS name. This method is used to find a computer when the exact netBIOS name for the target computer is known.
Inputs
-
MachineName: The netBIOS name for the computer to be found. Can also be in the format DomainName\MachineName. Anything but a complete match will result in failure.
Returns
-
Boolean: Success or failure.
Example
C#
var client = new lssc.LocalServicesSoapClient();
try
{
var result = client.FindMachineExact(“ACME\ACMEdvwks0012”);
if (result)
Console.write("found ACMEdvwks0012");
else
Console.write("cannot find ACMEdvwks0012");
}
catch(Exception ex)
{
//handle the error case
}
finally
{
client.Close(); //MUST CALL THIS
}
FindMachines
string[] FindMachines(string SearchText)
Purpose
Finds a number of computers matching a search string.
Inputs
-
SearchText: The search text matched against the netBIOS name for the computers to be found. Can also be in the form DomainName\SearchText
Returns
-
Array of strings containing the computers matching the search text. The number of items in this array is limited by the maximum number of returned items allowed.
Example
C#
var client = new lssc.LocalServicesSoapClient();
try
{
var resultArr = client.FindMachines(“ACME\ACME”);
//process the results array
}
catch(Exception ex)
{
//handle the error case
}
finally
{
client.Close(); //MUST CALL THIS
}
FindRegisteredMachine
string FindRegisteredMachine(string UserName)
Purpose
Finds the default computer registered to a user.
Inputs
-
UserName – the user name for an authorized user in the format DomainName\UserName
Returns
-
String containing the name of the computer registered to the user.
Example
C#
var client = new lssc.LocalServicesSoapClient();
try
{
var result = client.FindRegisteredMachine( "ACME\Joe" );
if (result == "")
Console.write("no registered computer for Joe");
else
Console.write( result );
}
catch(Exception ex)
{
//handle the error case
}
finally
{
client.Close(); //MUST CALL THIS
}
GetDisplayPages
String[] GetDisplayPages()
Purpose
Gets an array of the Web WakeUp pages configured for display by the administrator.
Inputs
-
null.
Returns
-
A string array containing all the pages enabled by the Web WakeUp administrator.
Example
C#
var client = new lssc.LocalServicesSoapClient();
try
{
var result = client.GetDisplayPages( );
//process results array
}
catch(Exception ex)
{
//handle the error case
}
finally
{
client.Close(); //MUST CALL THIS
}
GetMaxItemCount
int GetMaxItemCount()
Purpose
Gets the maximum number of items returned by Web WakeUp.
Inputs
-
null.
Returns
-
Returns an integer that gives the maximum number of items that will be returned in the array returned by FindMachines.
Example
C#
var client = new lssc.LocalServicesSoapClient();
try
{
var i = client.GetMaxItemCount();
console.WriteLine("The max items value: {0}", i);
}
catch(Exception ex)
{
//handle the error case
}
finally
{
client.Close(); //MUST CALL THIS
}
GetRegisteredMachines
String[] GetRegisteredMachines(string UserName)
Purpose
Inputs
-
UserName: The user name for an authorized user in the format DomainName\UserName
Returns
-
A string array containing all the computers registered for a user.
Example
C#
var client = new lssc.LocalServicesSoapClient();
try
{
var result = client.GetRegisteredMachines( "ACME\Joe”);
//process results array
}
catch(Exception ex)
{
//handle the error case
}
finally
{
client.Close(); //MUST CALL THIS
}
GetStatus
MachineInfo GetStatus(string MachineName)
Purpose
Determines the target machine's state using the 1E WakeUp infrastructure. The WakeUp Server is contacted, and will attempt to determine the machine's state using either an ICMP ping or a proprietary TCP message via the primary WakeUp Agent in the target machine's subnet.
GetStatus() will synchronously return the machine's most recent recorded state from a cache, but will asynchronously refresh this cache. The first time you call it, it may return an Unknown state if the machine has not been queried recently hence you may want to call it multiple times with at least a 10 second between each call and repeat until the machine's actual state (On or Off) is returned or until a reasonable number of retry attempts are exhausted.
In practice, a machine's status is normally returned in less than 30 seconds. If, after this period, GetStatus() still returns Unknown, it may indicate that the target machine cannot be reached within the 1E WakeUp infrastructure.
Making calls to GetStatus() in rapid succession is resource-intensive and will not reduce the time taken to determine the machine's state.
Inputs
-
MachineName: The netBIOS name of the machine whose status is to be retrieved. You may specify the machine with or without its domain name prefix (for example: MYMACHINE or MYDOMAIN\MYMACHINE).
Returns
-
MachineInfo: A structure containing details of the machine's status. The structure has the following fields:
-
_status - A enumeration with the values: 0=Unknown, 1=On, 2=Off
-
IPAddress: The IP address of the target machine.
-
MACAddress : The MAC address of the target machine.
The IPAddress and MACAddress fields may not be present if the status of the machine could not be determined. If the machine has multiple network adapters, the information returned will apply to the network adapter which has the highest priority mapping as determined by the WakeUp Server boundary configuration in NightWatchman Management Center.
Example
C#
var
client = new lssc.LocalServices();
try
{
var result = client.GetStatus(@"acme\ACMEdvwks0012");
var status = result._status;
if (status == lssc.State.On)
{
Console.WriteLine("The machine is on");
Console.WriteLine("Its IP address is {0}, MAC address is {1}", result.IPAddress, result.MACAddress);
}
else if (status == lssc.State.Off)
{
Console.WriteLine("The machine is off");
}
else // (status == lssc.State.Unknown)
{
Console.WriteLine("The status of the machine is unknown");
}
}
catch (Exception ex)
{
// Handle the error case
}
finally
{
client.Close(); // Must call this
}
Ping
bool Ping(string netBIOSName)
Purpose
Checks to see if a named computer is awake using information retrieved from NightWatchman Management Center.
Inputs
-
netBIOSName: The netBIOS name for the computer to check.
Returns
-
Boolean: Success or failure.
Example
C#
try
{
var result = client.Ping(“ACMEdvwks0012”);
if (result)
Console.write("response for ACMEdvwks0012");
else
Console.write("no response for ACMEdvwks0012");
}
catch(Exception ex)
{
//handle the error case
}
finally
{
client.Close(); //MUST CALL THIS
}
RegisterMachine
bool RegisterMachine(string UserName, string MachineName)
Purpose
Adds the default registered computer for a user using its name.
Inputs
-
UserName: The user name for an authorized user in the format DomainName\UserName
-
MachineName: The name for the computer to be added in the format DomainName\MachineName
Returns
-
Boolean: Success or failure.
Example
C#
var client = new lssc.LocalServicesSoapClient();
try
{
var result =
client.RegisterMachine("ACME\Joe",
“ACME\ACMEdvwks0012”);
if (result)
Console.write("ACMEdvwks0012 default for Joe");
else
Console.write("could not set ACMEdvwks0012");
}
catch(Exception ex)
{
//handle the error case
}
finally
{
client.Close(); //MUST CALL THIS
}
WakeByName
bool WakeByName(string netBIOSName)
Purpose
Attempts to wake a computer using its netBIOS name. If you intend to make a high volume of calls to wake computers in a short space of time you should use the WakeMachines method, which supports waking a list of computers, and not WakeByName.
Inputs
-
netBIOSName: The netBIOS name for the computer to wake up.
Returns
-
Boolean: Success or failure.
Example
C#
var client = new lssc.LocalServicesSoapClient();
try
{
var result = client.WakeByName(“ACMEdvwks0012”);
if (result)
Console.write("sent wake up to ACMEdvwks0012");
else
Console.write("no wakeup sent to ACMEdvwks0012");
}
catch(Exception ex)
{
//handle the error case
}
finally
{
client.Close(); //MUST CALL THIS
}
WakeMachines
bool WakeMachines(string MachineNames)
Purpose
Attempts to wake a number of computers on a list. The MachineNames list is a comma separated list of computers in the form "domainA\name1, domainB\name2, ..." There is a limit on the number of computers that can be awoken in a single call governed by the maximum length of the input argument.
WakeUp has an absolute upper limit of 10,000 computers that can be awoken in a single operation, but given the default value for the WakeMachines input argument length of 65536 characters and an average domain\computer name length of around 26 characters the default limit on WakeMachines is around 2500 computers.
To increase the default input argument size, change some bindings in the NWM.ServiceHost.exe.config file, see Setting the maximum number of computers returned.
Inputs
-
MachineNames: A list of computer names to wake up.
Returns
-
Boolean: Success or failure.
Example
C#
var client = new lssc.LocalServicesSoapClient();
try
{
var result = client.WakeMachines(“ACMEdvwks0012,
ACMEdvwks0013,
ACMEdvwks0014”);
if (result)
Console.write("sent wake up to computers");
else
Console.write("no wakeup sent to computers");
}
catch(Exception ex)
{
//handle the error case
}
finally
{
client.Close(); //MUST CALL THIS
}
The methods listed above may all be used in third-party applications. Any other methods in the Web WakeUp API are for internal use only and are not supported in third-party applications.
WakeUp class
This class provides the main interface for controlling WakeUp.
WakeName
Purpose
Send a wake up message to a single machine.
Inputs
-
string sInArg: The NetBIOS name of the target machine to be awoken.
Returns
-
string sOutArg: Returns a brief status message indicating success or failure.
-
uint32 ReturnValue: Exit code 1 success.
WakeColl
Purpose
Sends a wake up message to all resources contained in a Configuration Manager collection and its sub-collections.
Inputs
-
The name of the Configuration Manager collection containing the machines to be awoke.
Returns
-
Returns a brief status message indicating success or failure.
MachinePolicyRefresh
Purpose
Sends a Machine policy refresh message to a single machine.
Inputs
-
The NetBIOS name of the target machine to receive the policy refresh.
Returns
-
Returns a brief status message indicating success or failure.
collectionPolicyRefresh
Purpose
Sends a Machine policy refresh to all resources contained in a Configuration Manager collection and its sub-collections.
Inputs
-
The name of the Configuration Manager collection containing the machines to receive the policy refresh.
Returns
-
Returns a brief status message indicating success or failure.
WakeAll
Purpose
Sends a wake up message to all resources contained in the Configuration Manager collection “All Systems”.
Inputs
-
none.
Returns
-
Returns a brief status message indicating success or failure.
Deprecated
The following methods are deprecated and are no long supported.
-
MachineClientHealth
-
collectionClientHealth
-
MachineFixClientHealth
-
collectionFixClientHealth
Advertisements class
The read-only Advertisements class defines a table that holds all the Configuration Manager Adverts processed by WakeUp. The columns of the table are:
Column |
Type |
Description |
---|---|---|
AdvertisementName |
String |
The name of the advertisement processed. |
WU_Queued |
uint32 |
The number of queued. |
WU_Sent |
uint32 |
The total number of wake ups sent. |
WU_NotSent |
uint32 |
The number of wake ups that did not reach their destination. |
Awake |
uint32 |
The number of machines already awake. |
WokeUp |
uint32 |
The number of machines that were awoken. |
WillPing |
uint32 |
The number of awake machines without the 1E Agent installed. |
Failed |
uint32 |
The number of machines that failed to wake up. |
>NumRuns |
uint32 |
The number of times the advertisement was run. |
LastRunTime |
datetime |
The last time the advertisement was run. |
Example
The following JavaScript example retrieves the list of adverts and then iterates over the list converting to an HTML table containing the advertisement name. Clicking a name retrieves the advertisements details using the function GetColMembers(), not listed.
queryresult = false
oAdvertSet = null
oAdvertSet = gService.ExecQuery ("Select * from Advertisements")
queryresult = true
sList = ""
sList = sList + "<br><table border=\"1\"
width=\"100%\"> <tr><td
width=\"25%\">Advertisement Name</td><td
width=\"10%\">WU Sent</td><td
width=\"10%\">WU NotSent</td><td width=\"10%\">WokeUp</td><td
width=\"10%\">Awake</td><td
width=\"10%\">Will Ping</td><td
width=\"10%\">Failed</td></tr> "
if (queryresult)
{
// QUERY WAS SUCCESSFULL, POPULATE THE TABLES //
e = new Enumerator(oAdvertSet);
for (;!e.atEnd();e.moveNext())
{
obj = e.item();
name = obj.AdvertisementName
name = name.replace(" "," ");
sList = sList + "<tr><td valign="top"><div Class=\"Link\"style=\"cursor:hand;\" onClick='GetColMembers(\"" + name +"\")' "
sList = sList + "onMouseOver=\"style.color=OnColor\"onMouseOut=\"style.color=OffColor\">" + obj.AdvertisementName +
"</div></td><td valign="top">" + obj.WU_Sent + "</td><td valign="top">" + obj.WU_NotSent + "</td><td valign="top">" + obj.WokeUp + "</td><td valign="top">" +
obj.Awake + "</td><td valign="top">" + obj.WillPing + "</td><td valign="top">" + obj.Failed + "</td></tr>"
}
}
Agents class
The read-only Agents class defines a table that holds all the 1E Agents discovered by wake up. The columns of the table are:
Column |
Type |
Description |
---|---|---|
AgentName |
String |
Name of the discovered 1E Agent. |
AgentNameAlt |
String |
Name of the discovered 1E Agent's alternative. |
MaxBurst |
uint32 |
The number of ping packets to generate in a single burst. |
BurstDelay |
uint32 |
The delay in seconds between successive ping bursts. |
WU_Queued |
uint32 |
Number of queued wake ups. |
WU_Sent |
uint32 |
Total number of wake ups sent. |
WU_NotSent |
uint32 |
Number of wake ups that did not reach their destination. |
Awake |
uint32 |
Number of machines already awake. |
WokeUp |
uint32 |
Number of machines that were awoken. |
WillPing |
uint32 |
Number of awake machines without the 1E Agent installed. |
Failed |
uint32 |
Number of machines that failed to wake up. |
State |
uint32 |
Currently known state of the 1E Agent. |
AltState |
uint32 |
Currently known state for the 1E Agent's alternative. |
LastSentTime |
datetime |
Last time a wake up signal was sent. |
InSite |
uint32 |
Specifies whether the 1E Agent subnet is within or outside the site boundary. It will be set to one of the following values: 0 if the subnet is outside the site boundary 1 if the subnet is within the site boundary |
Example
The following JavaScript example retrieves the list of Agents and then iterates over the list converting to an HTML table containing the Agent name. Clicking a name retrieves the Agent's details using the function GetColMembers(), not listed.
queryresult = false
oAdvertSet = null
oAdvertSet = gService.ExecQuery ("Select * from Agents")
queryresult = true
sList = ""
sList = sList + "<br><table border=\"1\"
width=\"100%\"> <tr><td
width=\"20%\">Subnet</td><td width=\"20%\">AgentName</td><td
width=\"10%\">WU Sent</td><td
width=\"10%\">WU_NotSent</td><td
width=\"10%\">WokeUp</td><td
width=\"10%\">Awake</td><td
width=\"10%\">Will Ping</td><td
width=\"10%\">Failed</td></tr> "
if (queryresult)
{
// QUERY WAS SUCCESSFULL, POPULATE THE TABLES //
e = new Enumerator(oAdvertSet);
for (;!e.atEnd();e.moveNext())
{
obj = e.item();
name = obj.IP_Subnet
name = name.replace(""," ");
sList = sList + "<tr><td valign="top"><div Class=\"Link\"style=\"cursor:hand;\" onClick='GetColMembers(\"" + name + "\")' "
sList = sList + "onMouseOver=\"style.color=OnColor\" onMouseOut=\"style.color=OffColor\">" + obj.IP_Subnet +
"</div></td><td valign="top">" + obj.AgentName + "</td><td valign="top">" + obj.WU_Sent + "</td><td valign="top">" + obj.WU_NotSent +
"</td><td valign="top">" + obj.WokeUp + "</td><td valign="top">" + obj.Awake + "</td><td valign="top">" + obj.WillPing + "</td><td valign="top">" +
obj.Failed + "</td></tr>"
}
}
sList = sList + "</table>"
List.innerHTML = sList