The Windows app looks almost identical to the chat bar on Facebook.com. Users can permanently dock the chat bar on their home screen or access chat via the Windows system tray.
Users get notifications when friends want to chat. Friend activity is also shown, however clicking on these items will take you to a web browser. The same goes for messages in your Facebook inbox.
The chat bar is meant as a chat client and as such many of Facebook‘s features are disabled. For example, you can accept pending friend requests but if you want to search for new friends or check profiles you’ll need to go to Facebook.com. Facebook says the chat bar is a trial application so expect updates and changes (it is Facebook, after all).
Download Facebook for Windows 7 here