When you link your virtual device driver, you must use a module definition (.DEF) file. The first statement in the file must be
VIRTUAL DEVICE device_name
where device_name specifies the name of the VDD. The file cannot contain a NAME statement.
Once you have created your device driver, you must place a DEVICE statement in your CONFIG.SYS file to ensure it is treated as a device by the operating system.
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Developing Virtual Device
Drivers in OS/2
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Virtual Device Driver Calling
Conventions
Summary of Module
Definition Statements