dataComet for Macintosh OS X offers fast, reliable terminal emulation for local Shell sessions, Telnet, and serial devices such as modems Emulates VT100, VT220, VT320, PC-ANSI, SCO-ANSI, and IBM-3278 and IBM-3279 for mainframe access Extensive file transfer support: X/Y/ZModem, IBM IND$FILE Edit windows for off-line composition with easy paste-thru to emulator windows using the Enter key Thorough on-line documentation (500KB of text) On-line help: pressing Control and selecting a menu or dialog item fetches the documentation for the item Powerful AppleScript and macro support with automatic macro recording and an easy-to-use key remapping dialog Modeless dialogs ease session configuration .