You will only be able to use the Internet side of it if you know another user that also uses TRS2006 - if you wish to keep it in the same session/computer, you will need to set it to 'within same computer' (or equivalent), then set the destination IPortal ID.
You will need their username (if over the internet), as well as their IPortal ID if it is not the default.
You can setup the Iportals by using the ? option on the Buildings tab, then clicking on the Iportal.
This is all from memory, as I am not actively using TRS2006 nowadays - I mainly use TS2009 now.
Shane