Nevermind, it wouldn't. I meant in the if's.
Anyway, I figured out how to get new errorlevel settings.
set key=%errorlevel%
[b]echo %errorlevel% >C:\errorlevel.txt[/b]
REM ASCII value of key is contained in %Key%
Press a known key, then press an unknown key, and if it's different from the known key, you've got a new errorlevel.
If %Key%==48 echo 0 [%Key%]
If %Key%==49 echo 1 [%Key%]
If %Key%==50 echo 2 [%Key%]
If %Key%==51 echo 3 [%Key%]
If %Key%==52 echo 4 [%Key%]
If %Key%==53 echo 5 [%Key%]
If %Key%==54 echo 6 [%Key%]
If %Key%==55 echo 7 [%Key%]
If %Key%==56 echo 8 [%Key%]
If %Key%==57 echo 9 [%Key%]
::----------------------------------------------------------
If %Key%==13 echo Enter [%Key%]
::----------------------------------------------------------
If %Key%==27 echo Escape [%Key%]