From http://community.spiceworks.com/scripts/show/1702-log-off-remote-user-session

remote_session_logoff

mode con:cols=90 lines=25
@echo off
title=Remote Kill ^| © 2012 Ryan Jones v0.01
:start
set sessionid=
set host=
:enterhn
color 0F
cls
echo.
echo                         R E M O T E  S E S S I O N  L O G O F F                          
echo.
echo.
set /p host=Host to check: 
if '%host%'=='' cls&&echo.&&echo                         R E M O T E  S E S S I O N  L O G O F F&&echo.&&echo.&&echo you 

must enter a hostname to continue&&Echo.&&pause>nul&&goto enterhn
echo.
echo.
quser /server:%host%
echo.
echo.
set /p sessionid=Enter in a session ID to kill or press enter to return to the start: 
if '%sessionid%'=='' goto start 
logoff /server:%host% %sessionid% /v
echo.
echo Press enter to check another server
pause>nul
goto start