2:00 am 7/16/97
The cu format is identical to the ku format, but the
processing of action/events is different.  The input
statement

	Dick do walk

is interpreted as an action declaration in ku format,
but is interpreted as as an event declaration (the occurrence
of an action) in cu format.  Specifically, the statement is
interpreted as

	Dick do walk  at space=SPACE,time=TIME,view=VIEW

where SPACE,TIME,VIEW are the current values of space,time,view.
Each at phrase resets the current values.
