Any unclean pointer fiddling in C, and the process was terminated by the OS, so the machine was wonderful to use as a development box (especially with Purify installed) for software that would later be run on Windows or Linux.
I eventually bought my own refurbished (and using academic discount) 715 (instead of a car), so I had the fastest machine in our student dorm of anyone I knew, undergrad, grad student or professor. I could just write my Master's thesis when everyone else kept re-installing Windows - the HP never crashed in 6.5 years, which has left me with deep respect for the old-schol (pre-Compaq) HP engineers. The machine (21" color CRT) occupied half of my 9 square metre dorm room, but it also kept me warm.