mordant wit

The Microsoft- Google rivalry is shaping up as a titanic corporate clash for the ages.

It may not turn out that way. Markets and corporate fortunes routinely defy prediction. But it sure looks as if the two companies are on a collision course, as the realms of desktop computing and Internet services and software overlap more and more.

Microsoft, of course, is the reigning powerhouse of computing and Google is the muscular Internet challenger. On each side, the battalions are arrayed: executives, engineers, marketers, lawyers and lobbyists. The spending and competition are escalating daily. For each, it seems, the other passes what Andrew S. Grove, a founder and former chairman of Intel, calls the "silver bullet test" of strategic competition. "If you had one bullet, who would you shoot with it?"