Apple Macintosh System 7.5 - Manual (Page 51)

A system extension (INIT) that was working before the upgrade has been moved to the
May Not Work With System 7.5 folder and no longer works.
Try dragging the extension out of the May Not Work With System 7.5 folder to
the System Folder icon. Click OK when a message appears, then restart the
computer. If the extension still doesn’t work, drag it out of the System Folder
and contact the vendor for upgrade information.
What does the Printer Update Installer script for System 6 actually install?
It installs a new version of PrintMonitor, a new Backgrounder file to support
background printing, and new printer drivers corresponding to the printer
drivers previously installed on the Macintosh or PowerBook.
Can I move hard disks and floppy disks between computers running System 6 and
System 7.5?
Yes. However, a locked disk created with System 7.5 must be unlocked before
it can be used with System 6.
When a disk that has been used with System 6 is used with System 7.5, the
disk is updated to work with System 7.5 (a message informs you of the status
of the update).
When a System 7.5 disk is used with System 6, you may see new folders
named Desktop Folder and Trash.
What happens if I throw away the Desktop and Trash folders that appear when I use a
System 7.5 disk with a System 6 Macintosh ?
These folders contain whatever items are located at the desktop level or in the
Trash on that disk. If you throw away either of these folders, any item that was
located on the desktop or in the Trash will be erased.
49 Performing the Group Upgrade