[OhMeadhbh]

I wrote the PC equivalent for a similar product in the 1980s and wrote some different GEOS code. It was less convoluted than you might imagine. But it was very unforgiving in terms of de-referencing null pointers and memory leaks. Instead of using a little too much memory or causing a process to crash, it would often cause the system to hang. Windows 3 (and to a lesser degree Windows 95) had similar problems.