Advanced Micro Devices will detail its "Pacifica" virtualization technology by the end of this month, enabling software companies to start working with the feature, which makes it easier for a computer to <A HREF="http://news.zdnet.com/2100-3513_22-5600552.html?tag=nl.e589">run several operating systems simultaneously.</A> The Pacifica technology is scheduled to arrive in processors in 2006, later than the comparable Vanderpool technology--now officially called Intel Virtualization Technology--that is promised to appear this year in Intel chips. What's not clear is whether the two technologies will be compatible, raising the prospect of complications for some software makers.