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In the following example, the Windows functions MessageBeep and MessageBoxA (the ANSI version of MessageBox()) are used to inform the user of a problem. The return value from MessageBeep is discarded; the return value from MessageBoxA is used to determine whether or not to abort.
The function prototypes for MessageBeep and MessageBox, in the DLL_USER32 prototype record in the SYSPROCS table, are as follows:
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