If you mean you'd prefer the browser not do the default action of
submitting a form when the enter key is pressed, you can capture the
enter key and do something else. The code has been posted here several
times. Check the archives (google has nice archives at
http://groups.google.com).
It's not recommended, though. It basically breaks what the user is
used to - which can have implications with disabled people with
special browsers, too. It also irritates the hell out of people who
are used to their browsers doing something, then it doesn't. If this
is for an intranet application, CD-ROM, or game, disregard that.