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# PM Library Reference

This section contains the function and data structure references for the Portability Manager (PM) library used by the SciTech SNAP Graphics Architecture. The PM library provides a suite of functions used by the Binary Portable SNAP drivers, which abstract the Binary Portable driver code from operating system specific functions. There are versions of the PM library for every supported Operating System and target environment that provides the interface layer to between the Binary Portable device drivers and the target Operating System platform. Porting the SciTech SNAP drivers to a new Operating System is simply a matter of developing a new version of the PM library for that Operating System. This reference is intended primarily as a reference for developers porting the PM library to new platforms; application developers should generally not use the PM library functions directly.

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