In order to obtain more timely presence information for a user on you contact list than can be obtained by periodic polling of his ONLINE property, you can request to be registered as a contact's monitor. To do this, your client must send a TX_MONITOR_REQUEST message to the contact.
The format for a TX_MONITOR_REQUEST message is:
TX_MONITOR_REQUEST
tag
address
where
| tag | is a unique label for this message and |
| address | is the address of the user for whom you wish to become a monitor. |
If your contact accepts you as a monitor, his server will attempt to notify you whenever his on-line status changes.
Sending this message will cause the other client to receive an RX_MONITOR_REQUEST message.