GURU is a fast, slick program that tells you about your Mac model’s RAM possibilities: the amount of RAM your computer can handle, how many slots you can fill, and what combinations of chips you’ll need to reach a certain maximum amount of RAM.
 
What you need
A Macintosh.
Installation summary
Open the SOFTWARE SAMPLER folder on the CD-ROM. Open the GURU folder; if you like, drag the GURU program icon to your hard drive.
The manual
There’s really not much in the way of instructions, except this: launch the program. Choose your Mac model from the pop-up menu, and read all about it.