The ComKit 21 libraries are made to support programmers of COM-enabled environments. They replace the IPRO libraries of the version 12 SDK. The new version is tightly integrated with the latest CSDK Engine and is based on the OmniPage Ultimate architecture. The version 21 object model is largely backward compatible with that of version 16. As the CSDK OCR engine underwent a major revision between versions 12 and 15, the current object model is not backward compatible beyond version 16.

This document summarizes the COM object hierarchy of the SDK, and the interface details for the specific objects.

Since CSDK 15, this toolkit does not support Windows 9x platforms including Windows 95, Windows 98, Windows 98 SE and Windows Millennium editions. These OS platforms cannot be used as development platforms or runtime environments.