I was talking about making Messenger's main window appear when you run it (go to Messenger > Tools > Options > General, check "Open the main window...").
If you want to make it show up when it's already running
and you are
not using any polygamy patches (for using multiple Messenger instances), you can do this:
Go to your Start menu, locate the Messenger shortcut, right click it and go to properties. Click in shortcut (or however that's called in the English version
) and press the hotkey you want to assign to it, click OK and you have it.
I guess I could make it easier with a plugin, but my system is very unstable and I can't code anything until I change the RAM