UNIX-like is having your session or app time out because it gets no output. going all the way back to HP Omniback 2 running BCV split pre-exec scripts on an EMC array to back up a database to tape off a split mirror. Then aborting the backup because the array-side mirror split took over 15min, with no output.

UNIX-like is not a convention of UNIX - it's a convention of "we didn't get to making that useful thing yet, there's other stuff to do."