nal / nalexpld from other trees

I had to connect (thru Netware administrator)to a couple of NDS trees to
help someone at work and when I did it loaded the other trees'
Application Explorers on my workstation. How do I get these connections
to other trees to go away now? I searched the registry for the other
trees and deleted every instance I could find, rebooted, etc. I am about
ready to ghost my box and start fresh but I can't believe there's no
other way. Thanks