Captures a screen area of a remote virtual machine desktop, scales is down to the specified size, and saves it to a file on the client machine.

PRL_RESULT PrlDevSecondaryDisplay_SyncCaptureScaledScreenRegionToFile(
    PRL_HANDLE hVm, 
    PRL_UINT32 display, 
    PRL_CONST_STR fileName, 
    PRL_IMAGE_FORMAT format, 
    PRL_INT32 quality, 
    PRL_UINT32 x, 
    PRL_UINT32 y, 
    PRL_UINT32 width, 
    PRL_UINT32 height, 
    PRL_UINT32 scaleWidth, 
    PRL_UINT32 scaleHeight
);