NT4 Server Enterprise Edition? or not?

How can I find out if NT4 Server or NT4 Server Enterprise Edition is installed on my box? My licenses are stored off site and are packed up for a move and won’t be accessable for over a month. I need to upgrade a few of my servers and licenses to 2000 and I was asked which version of NT4 Server I have installed. I guess it’s a cheaper upgrade for the enterprise edition.

Thanks