Rocks was developed on a Mac+ running system 6.0.3. It's all I have; if it doesn't work on your Quadra 900 with a two-page display, then let me know.  Better yet, loan me your machine for a year or so to debug it (ha-ha!).
Note: It must be in the top left corner if you use it in multi-module. I don't know why
Send comments to the address below, or to A.Kirby1 on GEnie.  You can also find me on GEnie’s Mac RTC most Sunday evenings
If you would like the (Think Pascal v2.01) source-code to this module, send your name, address and $3.00 to cover the disk and postage, to:
Andrew Kirby
1017 Chipperfield Drive
Stroudsburg,  PA 18360