Instructions
Install GameSpy Arcade from the "Fallout Tactics" installation disc. You can also download and install the newest version from the official GameSpy Arcade website.
Launch GameSpy Arcade by clicking the "Start" menu button, clicking "All Programs" and then clicking "GameSpy Arcade." You can also launch the program by typing "GameSpy Arcade" into the Start menu search box and then opening the application from the list of results.
Click on the "Fallout Tactics" icon in the "Games" tab of the GameSpy Arcade window. If any active Fallout Tactics games are being played, they will be listed in the top panel of the tab.
Double click on an active server to join a game.