Apple Macintosh System 7.5 - Manual (Page 28)

Simultaneous user installations
It’s recommended that users do not attempt to access the upgrade server in
large numbers simultaneously. Although the System 7.5 Installer is a multi-
user program that supports simultaneous installations, the intensive two-way
traffic of installing and verifying software on multiple hard disks can
significantly degrade network performance.
Software compatibility
The System 7.5 upgrade kit contains the Safe Install Utility program to help
you assess the compatibility of the items in the System Folder of your startup
disk with components of System 7.5. You probably used this when upgrading
your own Macintosh or PowerBook in the first part of this handbook.
The Safe Install Utility is located
m on the Before You Install disk in the System 7.5 installation disks
m in the Before You Install folder on the Macintosh System 7.5 Group
Upgrade CD
The Safe Install Utility should be used for each computer on which System
7.5 will be installed.
System extensions and control panels in System 7.5
Many users have special system extensions and control panels in their System
Folders. (Before System 7, system extensions were called INITs, startup
documents, or initialization files, and control panels were called CDEVs.)
These files support application programs, drive peripheral devices, or add
functionality to the Macintosh or PowerBook. Because these programs are
often loaded as part of the startup process, a compatibility problem could
prevent the computer from starting up.
IMPORTANT Compatibility is most critical when a program is installed in the
System Folder. Be sure to use the Safe Install Utility before installing System
7.5 to identify and move any components that might not be compatible with
components of System 7.5.
25 Planning the Group Upgrade