The dollar's near-term fate hung in the balance on Feb 13, 2000 ahead of potentially market-movingcomments by Federal Reserve Chairman Alan Greenspan in Congress. Dealers generally expect Greenspan to adopt a cautiously optimistic tone on the U.S. economy when he appears before theSenate Banking Committee from 1500 GMT. This is because too downbeat an assessment could hurt already fragile consumer sentiment, while too upbeat a message might cause markets to scale back their expectations for