## Pen for OS/2 Device Driver Reference

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### Multiple Device Drivers

A pen device driver can be composed of a complex number of physical device drivers connected by private IDC calls. One driver should register on behalf of the collection of drivers. This driver will be called by the Pen for OS/2 system extension for IOCtls. The other physical device drivers are invisible to Pen for OS/2. Pen for OS/2 Device Driver Services must be called from the device driver that registered with Pen for OS/2 Device Driver Services.