How many more times do you need to have this explained to you before you realise that you are totally out of your depth on this? You have had lots of suggestions as to what you need to do but you obviously don't have the basic knowledge to implement them. I would suggest that you get hold of some books on basic C++ and Windows Programming and work through the sample code to get the understanding and skills you need to solve this problem.
Reposting the same question every day is just getting you more confused.
A service runs in the background, so where are these WM_COMMAND's coming from? You won;t have a menu, or a dialog box...
I think you need to go back to your basics - a service communicates with other programs using various interprocess communcations.
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