ETTV:Viewer's Guide
From WolfWiki
Introduction
Viewing an ETTV game is as easy as connecting your ET client to the ETTV server. Pay attention that you have the necessary maps / pk3s (like different ETPro folders) in your folders as not all ETTV admins might be so kind to offer downloads.
Normally what you see on ETTV is delayed by a minute or perhaps two, depending on the admin's choice.
All chat done on ETTV won't be seen on the game server (luckily). If certain chat starts to irritate you, you can easily ignore those chatters with the /ignore and /unignore commands in console.