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on-line vs online and off-line vs offline
sub-system vs subsystem
pull-down menu vs pulldown menu
Again, this seems to be a matter of convention. Within the
computer industry, these words usually are written without
hyphenation. Every Internet, computer and telecom dictionary I own
leaves the hyphens out of these words. However, my "regular"
dictionaries hyphenate online and offline; I didn't check the other
words.
I would go with what is convention within the industry, not
necessarily what's in a regular dictionary.
