Shoutbox

You'll need to add a check to see if you're signed in. The MISTATUS enumeration contains many values, so you'll need to use OnMyStatusChange() until you detect MISTATUS_ONLINE.

Tip: Use a bitwise AND to see if online, as all online-type statuses have bit 2 set.
In the latest Plus! API package, there's a Help file for the Messenger API.