This way of communication between processes very much resemble to the communication we do with our mail accounts. I would guess (smartly, no doubt) that was the key factor used for naming the functions when they were created. Information about mailslots can be found on microsoft's site, link. Summary could be that datagrams are used for communication and it's one-way and asynchronous. Attached zip file contains MailSlot.au3, AutoIt's implementation of these functions. Also there would be two sc