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typedef VBOXHGCMSVCPARM *PVBOXHGCMSVCPARM;
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typedef DECLCALLBACK(void) HGCMHOSTFASTCALLCB (int32_t result, uint32_t u32Function, PVBOXHGCMSVCPARM pParam, void *pvContext);
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/** Service specific extension callback.
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* This callback is called by the service to perform service specific operation.