I have a little batch file which directly launches the XP help file for NT commands:
@echo off
start hh.exe ms-its:%WINDIR%\Help\windows.chm::/ntcmds.htm
exit
Even if you have been using XP for a long time, it is always informative to look a the topic new “command-line tools”. There are some useful tools which I never seem to remember, such as eventquery and driverquery.