-w option, like registration has, that will dump data directly onto the disk. This removes the need for an external filer object and process, when reg is running with a large enough writable disk.
ImgData that's later released, instead of marshalling the entire ImgData object itself.
aplxsim dies, the system controller's listening loop goes berserk with "short read" warnings. Need to add a limiter that after, say, 50 short reads, drop the process.