Are these 2 Mac's on an ethernet network? If so, you must have file sharing on and also select appletalk. On Mac OS 9, bring up the appletalk control panel and select ethernet then quit, and say yes to save. Then bring up the file sharing control panel, and check the TCP/IP box, and turn on file sharing. On Mac OS X, bring up system preferences, select network, select appletalk, and check the box to turn make it active. In system preferences, then select sharing, and enable file sharing. In Mac OS 9, use the chooser to find the mac os x machine. In mac os x, in the finder, goto the Go menu item, and select connect to server.