The first obstacle is that debugging usually involves two separate machines connected by a cable—one running the debugger, the other one hosting the debuggee.
However, there is a much easier way, eliminating the necessity of a second machine, if live debugging is not a requirement. For example, if a buggy application throws an unhandled exception causing the infamous NT “Blue Screen Of Death” (BSOD) to pop up, you can choose to save the memory image that was in effect right before the crash to a file and examine this crash dump after rebooting. This technique is usually called post mortem debugging (post mortem
is Latin and means “after death”).
