Shoutbox

Starting up two MSN Messengers (with polygamy patch)? Sure, just add another line in the RUN-section of the registry.

But make sure you didn't tick "start automatically when Windows starts" in MSN Messenger. Also make sure that you didn't tick "Force plus to load when windows start up" in Messenger Plus!.

Because of the above, Messenger Plus! may not start up correctly (I needs to be started up before MSN Messenger). So if you also want Messenger Plus! you need to make a startup script in vbscript or something...

In other words, it is possible, but it is more complex* then you might think to let it  all work together.
*It all depends on how much you know about the registry, how Windows starts up, what MsgPlus exactly does when it starts up, the various settings in MSN Messenger and MsgPlus, and/or scripting (eg: vbscript, to make a startup script).

So, first give us more details of what you exactly want (Plus! or not) and what your startup-settings are in MSN Messenger and in Messenger Plus!. And also what RUN-registry entries you already have...

Signing them both in automatically? Nope, not possible, this is a limitation in Windows and/or MSN Messenger.