spUtils Preview Release 1 (2004-02-15) is now available as open source under the MIT license.
Hobbes: http://hobbes.nmsu.edu/h-search.php?key=spUtils_0-1
Special thanks to Tim Mecking for releasing the source code.
"spTim's Rexx Utility Package. Rexx extension library which provides functions to access the registry, PM API functions for manipulation window controls, and much more. Documentation (pdf) and example scripts are included."
More information:
Source code at: