Reading data from COM PORT in asynchronous mode.

I am using VC++ 6.0. I want a application to read data from COM port
whenever it comes, immediately I want to write in text file. It should work 24 hours. I copied source code from MSDN Library:- Serial Sample: Communications
Demonstration,The COMM sample (TTY) demonstrates using the Win32
communications functions while maintaining a common code base with
16-bit Windows code

I modified as my requirement. If I run it, it is reading and writing.
Suppose if I minimize the window or open some other application like word
it is not reading and writing. What is problem? How to over come from this?
Is it possible to write a application to run in background?

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Vinayak KumbarSr Program ManagerCommented:

here is the sample code that spies COM1 and COM2 running in background. Take a look at it. 

Hope that helps.

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System Programming

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