DCOM should be similar, although the configuration window looks quite a bit different, in XP vs 2000.
Go to the Run command and type "dcomcnfg" Go to Component Services >>Computers>>My Computer>>Dcom Config. In this Folder you will find the Application Specific Settings. Also in Component Services>>Computers>>My Computer (right mouse Click on My Computer and Select Properties)>>Go To DCOM Security to see DCOM general/default securities.
For more info on all these settings at these two places check out the following two links:
WWW.opcactivex.comD
COM Settings
Joji