Martin writes: > Okay, maybe this is a dumb question, but surely a file can only be built by > it's creator? (literal logic at work here!) True, but the :BUILD command can be used for more than building files... :FILE FOO,NEW;DEV=DISK;SAVE :PURGE *FOO << THIS BUILDS THE FILE FOO >> :FILE FOO,OLD;DEL :BUILD *FOO << THIS PURGES THE FILE FOO >> G.