IM Federators or aggregators

[vu3mmg]

Could some one point the implementation of federators/aggregatros such as nimbuzz .

When inter working with google it act as a federator .
But if you give your yahoo user name or password , whether nimbuzz server is acting as a client for you .

Or operators like nimbuzzz is having special agreement with yahoo, MSN and uses some polling or watcher mechanism to get mmy buddy's status for me?

[paulej]

I am not personally familiar with their product, but it looks like one of the several "all-in-one" clients that connect to a multiplicty of networks simultaneously. I don't think there is any real magic in that, though there's certainly work required to interface with all of those various networks.