After extensive testing, I found out that the number referenced in %SESSIONNAME% is not the same number as the session id under Win32_Process.

However, I did find that the %TEMP% and %TMP% env variables contain the session id at the end of the path.

Example : C:\Documents and Settings\[username]\Local Settings\Temp\[session_id]

I'm not sure how solid this is, but it'll do for now unless you guys have a better idea to get the session id. Here is the revised EnumProcess function which supports Terminal Server sessions.

Code:

Function ProductSuite ($Product)
	Dim $res, $x

	Select
		Case $Product = "None"
			$x=0
		Case $Product = "Small Business"
			$x=1
		Case $Product = "Enterprise"
			$x=2
		Case $Product = "BackOffice"
			$x=4
		Case $Product = "CommunicationServer"
			$x=8
		Case $Product = "Terminal Server"
			$x=16
		Case $Product = "Small Business (Restricted)"
			$x=32
		Case $Product = "Embedded NT"
			$x=64
		Case $Product = "DataCenter"
			$x=128
		Case $Product = "Single User Terminal Server"
			$x=256
		Case $Product = "Home Edition"
			$x=512
		Case $Product = "Blade Server"
			$x=1024
		Case 1 
			$res=MessageBox ("Invalid parameter used in function ProductSuite ($Product)",48)		
	EndSelect
	
	$ProductSuite = $x & Val(@ProductSuite)
EndFunction

Function GetSessionID
	Dim $sPath[]
	
	$sPath = Split(%TEMP%, "\")
	$GetSessionID = Trim($sPath[Ubound($sPath)])
EndFunction

Function EnumProcess($exe, optional $terminate, optional $Computer)
	Dim $winmgmts, $ExecQuery, $Process, $id, $sessionid
	Dim $GetObject
	If NOT $computer $computer=@wksta EndIf
	$winmgmts="winmgmts:{impersonationLevel=impersonate}!//$COMPUTER"
	Select
		Case Val($exe)>0
			If ProductSuite("Terminal Server")
				$sessionid = GetSessionID
				$ExecQuery="select * from Win32_Process where ProcessId='$exe' and SessionId='$sessionid'"
			Else				
				$ExecQuery="select * from Win32_Process where ProcessId='$exe'"
			EndIf				
			$GetObject=GetObject($winmgmts).ExecQuery($ExecQuery)
			For Each $Process in $GetObject
				If $terminate $=$Process.Terminate EndIf
				$EnumProcess = $Process.name
			Next
			$GetObject=''
		Case VarType($exe)=8
			If ProductSuite("Terminal Server")
				$sessionid = GetSessionID
				$ExecQuery="select * from Win32_Process where Name='$exe' and SessionId='$sessionid'"	
			Else		
				$ExecQuery="select * from Win32_Process where Name='$exe'"
			EndIf				
			$GetObject=GetObject($winmgmts).ExecQuery($ExecQuery)
			For Each $Process in $GetObject
				If $terminate $=$Process.Terminate EndIf
				$id=$Process.ProcessId
				$EnumProcess = "$Id" + "|" + "$EnumProcess"
			Next
			$EnumProcess=Left($EnumProcess,Len($EnumProcess)-1)
			$GetObject=''
		Case 1
			Exit 1
	EndSelect
EndFunction