Hi Djsoft,
What I mean by relay closures, say if a station is taking a satellite delivered program and that satellite network offers a station time during the hour to play local commercials/liners/IDs etc, the satellite network sends a command to a satellite receiver that has a series of relays in the receiver designed to allow stations to use whatever relays to trigger an automation program to do two things. One is to make an external piece of equipment made by Broadcast Tools, switch the audio from a network source to a local source, this case being the automation computer. The second thing is this allows the automation to play the local audio and then once the commercial break,ID etc is done, the automation "tells" the broadcast tools switcher to go back to the network audio source. Back in the MSDOS days, the automation computer would be interfaced through a serial port. These days that is achieved via a USB serial device. The momentary contact closures from the satellite receiver would in this case be received and recognized through the USB serial device.
No sloppy, messy DTMF tones would be required.
I am a broadcast engineer and would gladly test this if the described feature were ever incorporated in RadioBoss.
You may contact me directly if you need to, as I check into this site only every so often.