any time:
- 901 (instant message arriving)
+ 902 (instant message arriving)
- One or more instant messages have arrived for this client. When the client
-receives this message, it MUST act as if it just sent a GEXP command (the data
-following the 901 message WILL be a LISTING_FOLLOWS data transfer; in fact,
-the current implementation simply executes a GEXP command internally).
+ One or more instant messages have arrived for this client.