pinvoke.net: Edit: wtsapi32.WTSEnumerateProcesses

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Summary: The WTSEnumerateProcesses function retrieves information about the active processes on a specified terminal server.

!!!!C# Signature:
 [DllImport("wtsapi32.dll", SetLastError=true)]
 static extern bool WTSEnumerateProcesses(
    IntPtr serverHandle, // Handle to a terminal server. 
    Int32  reserved,     // must be 0
    Int32  version,      // must be 1
    ref IntPtr ppProcessInfo, // pointer to array of WTS_PROCESS_INFO
    ref Int32  pCount         // pointer to number of processes
 );

!!!!VB Signature:
 Private Declare Function WTSEnumerateProcesses Lib "wtsapi32.dll" ( _
     ByVal hServer As Int32, _
     ByVal Reserved As Int32, _
     ByVal Version As Int32, _
     ByRef ppProcessInfo As IntPtr, _
     ByRef pCount As Int32
 ) As Int32

!!!!User-Defined Types:
[WTS_PROCESS_INFO]
!!!!Alternative Managed API:
Much can be done with the System.Diagnostics.Process class with methods such as GetProcesses, GetProcessByName and GetProcessByID.

!!!!Notes:
None.

!!!!Tips & Tricks:
Please add some!

!!!!Sample Code:
 //C# sample code
 
 //Handle to the server that this code is running on.

[DllImport("wtsapi32.dll")]
 private static extern void WTSFreeMemory(IntPtr pMemory);

private static HANDLE WTS_CURRENT_SERVER_HANDLE = (IntPtr)null;
 
 public static WTS_PROCESS_INFO[] WTSEnumerateProcesses()
 {
	IntPtr pProcessInfo = IntPtr.Zero;
	int processCount = 0;
 	
	if (!WTSEnumerateProcesses(WTS_CURRENT_SERVER_HANDLE, 0, 1, ref pProcessInfo, ref processCount))
		return null;
 
	IntPtr pMemory = pProcessInfo;
	WTS_PROCESS_INFO[] processInfos = new WTS_PROCESS_INFO[processCount];
	for (int i = 0; i < processCount; i++)
	{
		processInfos[i] = (ProcessInfo)Marshal.PtrToStructure(pProcessInfo, typeof(WTS_PROCESS_INFO));
		pProcessInfo = (IntPtr)((int)pProcessInfo + Marshal.SizeOf(processInfos[i]));
	}
 	
	WTSFreeMemory(pMemory);
	return processInfos;
 }

//VB sample code
 Dim strucProcessInfo As WTS_PROCESS_INFO
 Dim ptrProcessInfo As IntPtr
 Dim lngPtrPos As Long
 Dim intReturn As Integer
 Dim intCount As Integer
 Dim intProcessCount As Integer
 Dim strProcessName As String

intReturn = WTSEnumerateProcesses(WTS_CURRENT_SERVER_HANDLE, 0, 1, ptrProcessInfo, intProcessCount)
 If intReturn > 0 Then
	'Get the length in bytes of each structure...
	lngPtrPos = ptrProcessInfo.ToInt32()

For intCount = 0 To intProcessCount - 1
		strucProcessInfo = Marshal.PtrToStructure(New IntPtr(lngPtrPos), strucProcessInfo.GetType)
		'ProcessName is merely a pointer to the string - convert it to the full string...
		strProcessName = Marshal.PtrToStringAnsi(New IntPtr(strucProcessInfo.ProcessName))

Console.WriteLine ("Process Name: " & strProcessName)
		Console.WriteLine ("Process ID: " & strucProcessInfo.ProcessID)
		Console.WriteLine ("Session ID: " & strucProcessInfo.SessionID)

'Now move on the pointer to the next member of the array...
		lngPtrPos = lngPtrPos + Len(strucProcessInfo)
	Next
 End If

Call WTSFreeMemory(ptrProcessInfo)

Documentation: WTSEnumerateProcesses@msdn on MSDN