[robespierre]

It was a library product from SGI that supported real-time simulations (such as military or aerospace) on their computers. The idea was to provide response time and bandwidth guarantees. GRIO (guaranteed rate I/O) was a part of the package. It allowed programs to reserve I/O bandwidth that would be exclusively for their own use.

I believe that react/pro 1.0 was for IRIX 5.3. There were later versions, such as 4.2 for IRIX 6.5.22

A doc for a later version is on the techpubs archive.