Netscape Communications Corp. said it is now offering America Online's <A HREF="http://www.foxnews.com/js_index.sml?content=/scitech/wires2/0219/t_rt_0219_40.sml">Instant Messenger</A>, which allows two people or a group to chat in real time over the Internet. It follows a similar pact announced last month by IBM Corp.'s Lotus unit to license the messaging system for its Lotus Notes corporate communications software.