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TL;DR: Provides extension disabling on boot in System 6 or prior by holding the mouse down or Space just like Shift does in System 7, but with popup options.
"init cdev" operates in two ways: as an INIT, and as a cdev (obviously!). The INIT can be activated by holding down the mouse button or the space bar when you StartUp (just after the "Welcome" message), and the cdev can be activated by going to the Control Panel and clicking on the "init cdev" icon.
Knowing how to activate "init cdev", you'll probably want to know why you should use it in the first place! "init cdev" will provide a list of all the INIT (StartUp), cdev (Control Panel) and RDEV (Chooser) files in your System Folder and let you turn them on and off. Once they're off they won't bother you again until you turn them on again.
In this way, you can keep a whole lot of INIT and cdev files in your System Folder without having to remove them whenever their services are not required. Also, you can choose to temporarily activate/deactivate files. They will be changed back again the next time you startup.
(12.42 KiB / 12.72 KB)
Version 3.0 (1990) / compressed w/ Stuffit
(9.1 KiB / 9.32 KB)
Version 2.0 (1989) / compressed w/ Stuffit
Emulating this? It could probably run under: Basilisk II