 ProComm flourished in the pre-World Wide Web world, when personal computers used modems to connect over telephone lines with other individual computers, online services such as CompuServe, bulletin board systems (BBSs), Telnet and Gopher sites, and the like.Datastorm was the first company to grow from a shareware publisher into a large commercial software publisher.ProComm 2.4.3 for MS-DOS is still available as shareware.