If it is not convenient to press CTRL+ALT+DEL (or the OS doesn't support it), type (on your Windows NT computer):

WhoLocal ComputerName

where ComputerName is the NetBIOS name of the computer you want to check.

WhoLocal.bat will echo a user=xxxxx where xxxxx is the locally logged on UserName (or null if no one is logged on locally). If UserName is logged on locally, it will set a user environment variable. You may also receive:

A session does not exist with that computer name.

which can be ignored.

WhoLocal.bat contains:

@echo off
setlocal
set machine=%1
set user=
If \{%1\}
\{\} goto syntax
for /f "Tokens=*" %%i in ('net sess \\%machine%') do call :user1 "%%i"
if not "%user%"
"" goto done 
for /f "Skip=5 Tokens=*" %%i in ('nbtstat -a %machine%') do call :user2 "%%i"
:done
@echo user=%user%
endlocal & set user=%user%
goto end
:syntax
@echo Syntax: WhoLocal ComputerName
endlocal & set user=
goto end
:user1
if not "%user%"
"" goto end
set param=%1
set param=%param:"=%
set param=%param: =%
set param1=%param:~0,8%
if not "%param1%"
"Username" goto end
set user=%param:~8,21%
goto end
:user2
if not "%user%"=="" goto end
set param=%1
set param=%param: