When I first connect to bnet using a muted cdkey, is there a way to determine if the cdkey is muted, maybe by trapping bnet informing me the cdkey is muted?

And also, just curious-- muted cdkeys are not allowed to go into channels, right?

if you request Bnet to send you the News, they will tell you there if you are muted/voided. To do this you can 1) Send 0x01 in SID_JOINCHANNEL or send SID_NEWS_INFO

Muted Keys: Able to join any channel(s) but are 'muted' so the other users cant hear
him/her talk. However you can talk in games

Voided Keys: Your new home is called 'The Void'. Hope you like the darkness. You cant get out of the void/talk to other users outside of games.

The news will also inform me whether the key is voided?

yea it well say somthing like
you have had ALL that chat function suspended or something
if your voided you will get 2 red messages back 1 for muted and 1 for voided

Or if you send 0x01 in your 0x0C DWORD, Battle.net will send you the "Your cd-key has been muted blah blah" in 0x0F 0x12 event ID (error message).

Shadow I said that allrdy

Perhaps, but he did explain how they would return it (0x12), and I needed that. :) But regardless, BOTH of you gave useful information, so thank you both! :D