Serial communication

Dear Friends,
 
I intended to let people, who have a serial device and who dont have it, practice with my tutorial. So I have developed a serial test interface program which can make one pc act as a serial device and test it by another pc. So what about the interested people who dont have two pcs? This question came to my mind and now im testing another utility with a loopback connection. Readers who have already gone through the link i gave about wiring diagrams, would already know what is loop back. For others, briefly, its a special wiring pattern for the DB9 female which you can use to communicate with the same pc via the RS232. 
 
I fallen sick this week so I was on leave for two days. I'm continuing soon.
 
By the way, can anyone tell me a way I can explain theories by using some graphics instead of just plain text in the mailing list. Because I experienced that attachments r not working with the list. I have a web server but i cant afford to keep my materila there for a long time. 
 
Thanks
 
Suren.

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