But what about the fact that they are *not* machine-specific?

Example from Gary's linked doc:

"Apple Hardware Test (iBook) - Size 10 MB
Apple Hardware Test for iBook Version 1.2.4 CD for use with iBook (FireWire), iBook (Dual USB), iBook (Late 2001), iBook (14.1 LCD), iBook (16 VRAM), iBook (14.1 LCD 16 VRAM), iBook (Opaque 16 VRAM), iBook (32 VRAM) and iBook (14.1 LCD 32 VRAM)."

The new Great Equalizer is the SEND button.

In Memory of Harv: Those who can make you believe absurdities can make you commit atrocities. ~Voltaire