To toggle between two files during one session with vi:
	vi <first filename>
	...             (editing of first filename)
	:e <second filename>
	...             (editing of second filename)
	:e #            (will edit first filename)
	...
	:e #            (will edit second filename)
	...
    etc.
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	James Van Ornum, AT&T Bell Laboratories, inhp4!houxu!jhv