Users use Office 2003 and Windows XP SP2.

When users try to open a WORD document on SharePoint, the document
opens, however, a login box is prompted. It seems Office is trying to
open the task pane on the right and show the Shared Workspace. Quite
annoying.

I tried to disable Client Integration in the Authentication Providers,
it did not make any difference.

When I tried to do the same thing on another Windows 2003 server work
station, with Office 2003, I do not get the login prompt. And the task
pane does not show up either.

On both desktop, the web site shows in Internet Zone.

It looks like it has something to do with the Client setting, either IE
or Office. But I could not figure out where the setting is.

Anyone has some experience on this?