Microsoft used another SSP known as Gate Keeper Passport, that worked from the same method but required certain attributes related to the user's account.
There have been various methods through the use of m IRC to access the MSN Chat Network.
As specified in the IRCX Draft, The client sends a string using the prefix "I" for initial and then the client and server will attempt to authenticate.
The Gate Keeper mechanism is not publicly documented.
The use of third-party applications on the MSN Chat Network was not prohibited, although it was unsupported.