Each service has its own protocol and servers.
AIM is run by AOL and you will connect to AOL's servers using the protocol AOL have defined.
The same goes for Yahoo messenger, MSN messenger and IRC, each using different server and protocol
quote:
Originally posted by mad_onion
if you dont understand that question mabye i can you just answer what messengers can chat with each other? for example can people using Yahoo Messenger chat with people using MSN?
No. Because as i said above each use different protocols and servers.
Although it is possible to code a client that can use all the services combined together. For example Gaim.
Also the AIM network is just a term for the servers and protocol AIM (AOL Instant Messenger) uses.