Try this:
Write AppleScripts for system 7 to reboot into 8, and for 8 to reboot into 7. The script could automatically move one desktop file to a "Disabled" location, then move the other back to the normal location, then switch the startup disk and restart for you. It could do this in all 3 partitions.
Then if you want 6 while in 8, use the script to reboot to 7, then reboot to 6. If you want to go from 6 to 8, reboot to 7 then use the script to go to 8. Because I presume that there's no problem switching between 6 & 7.
There are only 2 potential problems I see with this:
1. Getting AppleScript to move a hidden file.
2. Maybe the desktop file is written to when the shutdown command is invoked. This could defeat the whole purpose.
Write AppleScripts for system 7 to reboot into 8, and for 8 to reboot into 7. The script could automatically move one desktop file to a "Disabled" location, then move the other back to the normal location, then switch the startup disk and restart for you. It could do this in all 3 partitions.
Then if you want 6 while in 8, use the script to reboot to 7, then reboot to 6. If you want to go from 6 to 8, reboot to 7 then use the script to go to 8. Because I presume that there's no problem switching between 6 & 7.
There are only 2 potential problems I see with this:
1. Getting AppleScript to move a hidden file.
2. Maybe the desktop file is written to when the shutdown command is invoked. This could defeat the whole purpose.