the author of this app says:
Online is a VT100 terminal emulator for the handheld.
Online can connect a handheld to another computer system and access real computer power and network resources from anywhere. The new manager can connect with multiple serial ports.
An added bonus is that the memo pad that allows you to send text from memo pads.
Online can been used to connect to UNIX systems and then surf the Web using Lynx, or edit files with VI and Emacs.