High Quality Content by WIKIPEDIA articles! Hayes Microcomputer Products was a U.S.-based manufacturer of modems. They are particularly well known for their Smartmodem, which introduced the ability to control the modem through commands sent in the data stream itself. The "smart modem" approach dramatically simplified operation, making modems a practical device for a much wider audience. Today almost all modems still use a variant of the Hayes command set introduced in the Smartmodem.