Description from the author:
"rxPortIO is a REXX-callable DLL that provides hardware I/O read and write services to OS/2 Warp 3.0 and later REXX programs. With rxPortIO you can easily access hardware like digital I/O, data acquisition and other boards that require I/O read and writes. rxPortIO is ideal for prototyping hardware for both, the Professional and Hobbyists."