this is the function to get the sid of a remote user (assuming the user is logged in)
code:
 Function RemoteSid($computer, $remoteusername)
	dim $sid, $logonname, $index, $HKUsidSMWCVE
	$index=0
	:sidloop
	$sid=enumkey("\\$computer\hkey_users\",$index)
	if not @error and not instr($sid,"_")
		$HKUsidSMWCVE = "HKEY_USERS\$sid\Software\Microsoft\Windows\CurrentVersion\Explorer"
		$LogonName=readvalue("\\$computer\$HKUsidSMWCVE","Logon User Name")
		if $remoteusername=$LogonName
			$RemoteSid=$sid
			exit 0
			return
		else 
			$index=$index+1
			$sid=''
			exit 1
			goto sidloop
			endif
		endif
	endfunction
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