Net resources with Rendezvous

Webcam iChat and the net resources with Rendezvous!!!

Rendevous is a good application because it allows to see in automatic all the
net resources without any dedicated setting.
But it would be great to share Rendevous applications into different networks.
In this way someone logged into the A network could see all Rendevous’s
services of someone else logged into network B.

Please, does anybody know a way or a software Mac that allows to open a tunnel compatible with IChat and Rendevous between 2 different networks ?

Thank you for your kind reply
Ezio