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winInet cache

hi all,
im using the wininet library to download files from the net--web cam pics to be precise and the problem is, after downloading a pic once i always get the same pic in later trys. seems to have to do with windows internal buffering. while the pic of the webcam obviously changes all the time, the InternetReadFile() only gives me the pic which is already in the buffer.
i've tried to close and reopen the whole session with InternetOpen() and InternetCloseHandle() but same result. only way is restarting the program.
is there any way to clear that damn cache??
thanks
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