Installing an Alternate Difference Viewer
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You can install an alternate internal difference viewer by using the Tools API, a library of internal tools delivered with the product in the /source/ToolsAPI directory (The Subversion implementation is built using the tools in ToolsAPI.pas and FileHistoryAPI.pas).
For more information about using the Tools API, see Extending the IDE and the comments in the code files themselves.
The IDE supports multiple external difference viewers in addition to the built-in difference viewer. Use the External Difference Viewer dialog box to add a new external difference viewer.