Having written both application and system code for PC/GEOS, it never appeared to have been written by 10Xers. For the record I've worked with EPOC-32, Windows

Having written both application and system code for PC/GEOS, it never appeared to have been written by 10Xers. For the record I've worked with EPOC-32, Windows, NextStep, Linux, VxWorks, and Nucleus - none of them was as painful as PC/GEOS (although EPOC-32 sometimes came close...)