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RS 232 Spying programming

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ahmed osama

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I know there are many program spy on RS-232 but how these programs work ,how they read a port which is already opened from other processes !!

Any One Can Help PLZ :)
 

Such programs actually install a filter driver and work in the kernel mode.
 

checkmate said:
Such programs actually install a filter driver and work in the kernel mode.
Click to expand...

Great ,do you have any extra hints about using the Kernel mode and how windows allow any process to operates in such mode :) :?
 

a brief description is here:
**broken link removed**

source code for the technique used is available but not for portmon itself
 

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