@echo off
setlocal
set uon=N
for /f "Tokens=*" %%i in ('dtreg -Quiet -ListValue "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell"') do call :shell "%%i"
endlocal&set uon=%uon%
goto end
:shell
set sv=%1
set sv=%sv:"REG_SZ =%
set sv=%sv:"=%
for /f "Tokens=2" %%i in ('tlist') do call :find "%%i"
goto end
:find
if "%uon%"=="Y" goto end
if /i "%sv%"==%1 set uon=Y
:end