There are ways.
It depends on the network that you go to.
Undernet is the one that I frequent, I'll explain the method they work in:
You go to their website and register a login ID.
Like WeasteDevil with password "iluvronaldo" or whatever you'd like
Use mIRC[I'm not specifically saying that you have to use mIRC, but it is very user friendly; once I tell you what to do, you'll catch on you very quickly] and connect to undernet.
Log in to their identification bot[bot = 'internet robot' in layman's terms] by typing this:
/msg
x@channels.undernet.org login weastedevil iluvronaldo
This will have you logged in and will be sufficient to identify whether you are actually weastedevil. Once you do a WHOIS on a person(a whois is a command to check a person's IP, what rooms they're in and other useless rubbish like that), it'll say "User is logged in as WeasteDevil'
To make it easier, if you just type //mode $me +x upon connecting, this will hide your IP and display your IP as WeasteDevil.users.undernet.org
Then join the room made for redcafe by typing /join #roomname
All you need to do is just inform people on here what your login is.