Avoiding dependencies when opening and using devices
GDDM V3R2 Base Application Programming Guide
SC33-0867-01
When you open a device in an application program, GDDM needs to know the
device's characteristics in order to process output to suit it. You can
specify this information for GDDM in the DEVTOK (device token) parameter
of the DSOPEN call or an associated NICKNAME statement. See "Devicesupport in application programs" in topic 18.0. However, many programmers
prefer not to supply a specific device token and instead code an "*"
(asterisk) on the parameter. This forces GDDM to obtain the information
itself, by querying the device.
GDDM V3R2 Base Application Programming Guide
Copyright IBM Corporation 1990, 2012
