Can someone please tell me how I can find out what "hotfix" has been loaded?

I did not set up our current server and I'm getting an error when I backup
the exchange server. I found in the Knowledge base that I need to apply
a hotfix, but it also tells me to load them in order you know 1 before 2,
20 before 18 but it does not tell you how to find out what hot fix has been

I'm running Backup Exec for windows 2000 server v8.60 Rev 3878.

Thank you in advance.