i run it one one of my computers, not the one i use though

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I have a Dos application I sell, some process control stuff.
and yes people still buy it, sold 25K worth of it 1 1/2 year ago.
The application will run in XP but why would they want 2 update 2 XP when all they use is my software on the computer.
still got around 50 of them in use.