Every asynchronous function in the Parallels API returns a handle of type PHT_JOB. An asynchronous function returns immediately and the corresponding task is processed in a background thread. The returned job object is used as a reference to the job. While the operation is running, the job object can be used to find out the status of the operation, to get a progress report, or to cancel the job if needed. When the job completes, the job object is populated with the operation return code and the operation result (where applicable). The methods provided by the object can be used to extract this information. Once you are done processing the results, you must destroy the job object using the PrlHandle_Free function. For detailed information about jobs and asynchronous functions, please also see the Parallels Virtualization SDK Programmer's Guide .