Guys:

What was the most dificult/chalenging programming proyect u have ever worked on?

For me, it was a DOS proyect, 6 years ago. I was working on a Pager Company and I was automating the disconection process (disconecting people that didn't pay their monthly fee). There were 2 diferent applications, one for the Acct/POS and another for programming the Pager Units on the Paging Terminal. I had to hack the interrupt 23 to make a TSR (Terminate and Stay Resident Program) that started one app and then hack the Video Driver and Keyboard Buffer to simulate the user browsing the customer accounts. Take note of wich customers didn't pay and then shut that app down, start the other one, call my disconection list and disconnect the selected units.

There was no easy way to exchange data from those 2 app. Before that automation, the operation was a 2 employes proccess. One on the ACCT app dictating the Units number to be disconnected, and another one on the Paging Terminal APP disconecting the units. About 2000 units were disconnected every end of month. It was like a lottery game:

User 1: Unit 4522553
User 2: Bingo!
User 1: Unit 8542113
User 2: Already Disconnected, go ahead!
User 1: Unit 2314578
User 2: That's mine, I will pay tomorow, go ahead!.

I spend 5 months, making it work. The TSR, the Keybord Buffer thing, and the Video Driver stuff almost make me quit. And the RAM memory limitations!... uff But finally I did it. BTW, I used Borland Turbo C.

Ruben
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To err is human; to really foul things up requires a computer!