Sharing as in... what? If you mean getting access to files on that computer, the whole point of linux is to allow multi-user access. Set up telnet/ssh and you should be able to log into that box without major problems [do secure it well enough so your network router doesn't become some skid's whore]. Or, for only file access, ftp would do it.

If there's something else you had in mind... please be a little bit more specific.