Checking that QMF devices are queriable

GDDM must be able to query device characteristics for all devices used in QMF operations.

QMF manages the display of panels and data by using GDDM services. To build and convert each data stream into a device-specific form, GDDM must be able to query device characteristics for all devices used in QMF operations.

To make sure that each device can be queried, check the bytes of the PSERVIC operand of the VTAM® MODEENT macro. These bytes define the display device or printer type and are set differently for queriable versus nonqueriable devices.