From Conklin Systems:
CS Online is a VT102/ANSI terminal emulator and Telnet client for Palm OS organizers. Connect to Unix systems, configure routers, and reprogram embedded computers. Then use hex mode and extensive logging options turn your handheld into a data stream analyzer and recorder. With CS Online you can leave the laptop behind. CS Online features hi-res 80-column support, Xmodem/Ymodem file transfers, communication via serial/IR/Bluetooth/802.11, and logging your data directly to HTML files. See for yourself why we call it the Serial Data Power Tool.