There was one network monitoring company that used Smalltalk, and Smalltalk's ability to very rapidly save the entire memory image. Basically, for exceptions, a

There was one network monitoring company that used Smalltalk, and Smalltalk's ability to very rapidly save the entire memory image. Basically, for exceptions, a snapshot of the server's state could be saved off in addition to the log, then brought up later, completely live, with a debugger on that very method. (Definitely a distributed system, running on other people's hardware in other people's data centers.) I worked at another company where we used a different kind of Smalltalk serialization to save the GUI's state in an auto-generated error email or log entry, so we could open the application in the exact same UI state when dealing with a bug.