## Display Device Driver Reference for OS/2

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### Seamless Design Issues

There are multiple design issues in the seamless environment. The critical issues (those generating the most questions), are documented in the following sections:

Determination of code and data to be shared between the PM and Windows display drivers

Coordination of off-screen video RAM

Save/restore processing of the video hardware registers/environment

Implementation of semaphore and heartbeat processing

Conversion of Windows cursors and icons in the PM environment

Palette handling

Sharing of cursor exclusion and Enable/Disable code, including problems to be avoided

Setup and sharing of a pointer to video RAM.