The information is stored in the registry, most likely somewhere under the "HKCU\Software\Patchou\MsgPlus2\your@email.com\Preferences" key. Sorry I can't find out exactly where, as I have Live! installed on this computer. If you find it you could export the names as a .reg file and then open it on the second computer and the names should be applied (someone correct me if I'm wrong)
Alternatively, you could always use the Export Settings in Plus preferences for what you wish to do and then use this settings file on the second computer. I suggest reading
this tutorial and see if that helps
Note: Editing the registry incorrectly can cause serious problems that may require you to re-install Windows, so if you don't know what you're doing I'd advise to leave it alone