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The process of correcting and improving the default behavior of 4th Dimension is actually quite simple. As of 4D v6.7.x, the environment includes the functionality required to do these types of improvements directly. Patches to the default environment are easily installed as 4D extensions.
The key aspect of understanding how the FU4D extensions were created involve understanding that much of the 4D environment is actually written in 4D. By leveraging this aspect of 4D, the FU4D extensions were created literally in just a few hours of time. It was a relatively simple matter to examine what areas of 4D were actually written in 4D, provide replacements and enhancements for some of these areas, and release the FU4D package.
For exact details on how this can be done, it would be best to subscribe to Planet 4D. The very first issue of Planet 4D, scheduled to be available towards the middle of July 2002, contains an article detailing exactly the steps required to create your own 4D extensions.