NT user == 2 unix users

[Kevin Elliott]

Hmm, I have an interesting situation.

I have files on my FreeBSD machine owned by a user "admin", and group
"files". Now, while my user "knight" on my NT machine can access these
files because it is in the files group, I do not have permissions set to
read/write for the group, only the user.

However, I would like to allow ONLY my NT login "knight" to act as admin,
but while maintaining it's identity as knight.

How can I could about this so that knight can be both knight and admin.
Thanks I appreciate all your input!

Kevin