semex An interactive exerciser for the semctl, semget, and semop calls, originally from System V Unix. This was originally written sometime in the dark and backward abysm of time back in the 1980s. If you are on a 32-bit machine or using a compiler where you can't count on a memory address being the same size as a long int, see the WARNING comments in the code. The latest version of this code lives at . Eric S. Raymond