A simpler solution is just to limit the returned processes to those started by this session.

The following code does that. I've not tried it on a farm member server console but it should work there too as it works OK on a stand-alone machine.

Code:
If InStr(%SESSIONNAME%,"#") $sSession=Split(%SESSIONNAME%,'#')[1] EndIf

If Not CInt($sSession) $sSession=0 EndIf

 

$strComputer = "."

$colProcesses = GetObject("winmgmts:" 

   + "{impersonationLevel=impersonate}!\\"

   + $strComputer

   + "\root\cimv2").ExecQuery("Select * from Win32_Process Where SessionID='"+$sSession+"'")



For Each $objProcess in $colProcesses

    $objProcess.SessionId ": " $objProcess.Name ?

Next