IBM and Novell Inc. will unveil a <A HREF="http://nt.excite.com/news/r/990321/15/business-novell">pact</A> today, which will use Novell network software to link many office computers ready to handle electronic commerce operations. The two companies plan to announce the pact Monday at Brainshare, the annual Novell software developers' conference set in Salt Lake City this week.