You’ll need to install and run a VNC server on each machine that you want to remotely access. You can find VNC servers for pretty much any OS free of charge: Vine Server for Mac and RealVNC for XP to name a couple.
Once you have the Servers running on the other machines you will need to use a VNC viewer from your powerbook to establish a connection. You can purchase Vine Viewer for your Mac here:
I would recommend that you understand what VNC is and how to use it before you purchase a license. There is a lot of information posted in the forums in regards to usage, so please search before you ask. I would also recommend that you read the Vine Server FAQ and the Vine Viewer documentation. Both documents are accessible from the “Help” menu. You can request a trial license of Vine Viewer here: