Two of us in the company experience seemingly random popups of a NetWare
login screen, with "system" in the username block. We can cancel out of
this easily enough, but I'd like to determine the cause and stop it.

WinXP workstation, NetWare 6.0 with client 4.83 SP1. If I use the newer
client, it greatly slows the response to MS mapped drives (Win Server 2003).

I use this same client, same setup on all machines here. IP only.