in reply to Controlling a TTY via screen position

There is an old sourceforge project for a tn5250 terminal emulator over telnet.

Perhaps by studying the sourcefiles you can learn more about this protocol. The project also has some termcap and terminfo files which detail the codes used to drive the terminal.

CountZero

A program should be light and agile, its subroutines connected like a string of pearls. The spirit and intent of the program should be retained throughout. There should be neither too little or too much, neither needless loops nor useless variables, neither lack of structure nor overwhelming rigidity." - The Tao of Programming, 4.1 - Geoffrey James

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