Regarding Screen changes

[santosh k]

Hi Mr.GopalaKrishna, Iam Using VC++, Iam planning to capture the screen, saving into .BMP format and iam able to do this. My question is I want to capture the screen whenever the changes happen on my desktop. Can any one tell me how do i know whether the screen changed or not. i mean through which event we can find it out. Thanks in Advance. Regards Santosh.K