I'm lazy when it comes to that since I'm *required* to open the Steam Community manager (which never remembers my user/password for some reason, that shit should be automatic if I'm logged into Steam).
Valve really needs to get off their ass and allow acception of player invites from the Friends List directly.
(and allow us to add Groups to our Friends List to categorize our list while we're at it with Alias support. Annoying having Family/Clan/Furs/Friends all jumbled into one big mess)

