Here is a list of items that get turned off by holding down the shift key during startup:
* MacsBug - however, MacsBug will load if the option key is also held down along with the shift key in System 7.5 and later.
* All extensions in the Extension folder, Control Panels folder, and System Folder.
* A/Rose - even though it is an init and would be turned off anyway, it is explicitly not loaded.
* Any software component of type 'thng' will not be registered.
* All scripts (for non-roman character input).
* Virtual Memory.
* Resources of type AINI which are AppleTalk drivers, this is where Open Transport gets turned off.
Other effects:
* The disk cache is set to 96K in System 7.5 and 64K in System 7.0 or System 7.1.
* The Finder will not launch files in the Startup Items folder, or execute the items in the Shutdown Items folder at Shut Down.
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