Plz help me in finding the transpareancy of image

i want to display a transparent image(some part of that image is
transparent)frame (24bit) over another image. is there is any way we
can find that that particular part of that image is transparent..
means is there is any options or member in bitmapfileheader,or
bitmapinfo to identify that .Could any one give one sample code for
that. i am using platform SDK.

.

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