Returns the backup user login.
PRL_RESULT PrlDispCfg_GetBackupUserLogin( PRL_HANDLE hDispConfig, PRL_STR sUserLogin, PRL_UINT32_PTR pnUserLoginBufLength );
PrlApiDisp.h
PRL_RESULT. Possible values are:
PRL_ERR_INVALID_ARG - invalid handle or null pointer was passed.
PRL_ERR_BUFFER_OVERRUN - the size of the output buffer is not large enough. The parameter that is used to specify the size will contain the required size.
PRL_ERR_SUCCESS - function completed successfully.