A. On the resource kit for NT you'll find a program called IFMEMBER, this is what you'll have to base your login script upon. Important safety tip, IFMEMBER works by checking for membership in a group and returning an ERRORLEVEL hence you'll have a bunch of IF THENS..
Ifmember sets errorlevel to the number of groups in the list that the user is actually a member of, for example:
If you typed command
ifmember group1 group2
an errorlevel of 2 would be returned.
if %errorlevel%==1 <command>