Dr.
Watson was also the old version of the
windows debugger before
windbg came along. It shipped with
Windows 3.1 and
Windows 95 at the very least. (The
EXE name was
drwatson)
You could break into it, and have it monitor some basic system events. Whenever a Windows system dies, it shells out to a debugger (BSOD), rather than having it integrated into the kernel area. That would create some rather weird and hard to control dependancies.