how can i access a printer by several computers trough a home network?

Answer 1

There are hardware adapters which would allow you to connect it directly to the router, however, that aside ... all you need to do is install it on one of the networked PCs & then enable sharing of the printer.

Instructions :
http://www.microsoft.com/windowsxp/using/networking/expert/honeycutt_july2.mspx

regards,
Philip T

Answer 2

Make sure you printer is linked to the server. Once your network is setup, other computers will recognize the printer on the network.