Lets to setup password for virtual hard disk device in case if last one is encrypted (this password uses then at calls PrlVmDevHd_CheckPassword and PrlVm_Commit)
PRL_RESULT PrlVmDevHd_SetPassword( PRL_HANDLE hVmDev, PRL_CONST_STR sPassword );
PrlApiVm.h
PRL_RESULT. Possible values:
PRL_ERR_INVALID_ARG - invalid handle or null pointer was passed.
PRL_ERR_SUCCESS - function completed successfully.