Deactivate installed Parallels license.
PRL_HANDLE PrlSrv_DeactivateInstalledLicense( PRL_HANDLE hServer, PRL_UINT32 nFlags );
PrlApiDisp.h
A handle of type PHT_JOB containing the results of this asynchronous operation or PRL_INVALID_HANDLE if there's not enough memory to instantiate the job object.
To get the return code from the PHT_JOB object, use the PrlJob_GetRetCode function. Possible values are:
PRL_ERR_INVALID_ARG - invalid handle was passed. PRL_ERR_SUCCESS - function completed successfully.
To get the result from the PHT_JOB object:
the PHT_RESULT object.
of type PHT_LICENSE containing the license information.