The first post was talking about Mac OS 9.0's TCP/IP File Sharing capability. The catch? Both Computers must have Mac OS 9.0 installed. You must know the host computer's IP address (if the host--the one you wish to access via TCP/IP--is using PPP, which assigns an IP each time you dial up, you must somehow find out the IP address and enter it in the "chooser/appleshare" window"
The second post was referring to Apple Remote Access (ARA), which is completely different from Mac OS 9.0's File sharing over TCP/IP