What's it say? I'm not German but I know the language pretty well.
Can't you put an Alias to MagiCMac in the 'Startup Items' folder (within the system folder)?? That might work...I don't yet have MagiCMac, I don't have a Mac I can run it on yet! I don't think it would work well on my Mac Classic ;) and my iMac is running OS X and I don't think it likes the runtime version of OS 9.2.1 :(
When the PB160 arrives, then shall I have my portable Atari....:)