If have had the pleasure in using the source for an experiment with a terminal application that I have been working on. I was pleased to see how much functionality was put in the application. Beforehand I used Hyperterminal from Microsoft to do the talking. I made some changes to the source for my need and would not mind to share this with you. Changes: - send each typed character. I added a button to toggle continous mode (continous= send each char, non continous= send string typed in command Textbox. Updated CommPort to send each character. - include ENTER key as charakter. Therefore I had to inherit the "Command" Textbox and capture keystrokes. If you are interested I can send the source. Thank you for sharing the code!