Participants in a Comdex meeting of the Personal Computer and Communications Association (PCCA) concluded that two major challenges face the handheld PC. The first is the inability of wireless users to connect back to their own desktops or local area networks. The second is the lack of enabling handheld synchronization software for wireless networks. A PCCA delegation plans to convene with Windows CE developers at Microsoft in December to address the sychronization problem. More than a half-dozen handheld PCs running under Microsoft's Windows CE were introduced this week at Comdex.