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D. IMPLEMENTATION AND PRACTICALITIES
It is clearly possible to design and produce such a package without reference to existing packages. This could prove to be expensive and inappropriate, especially for a demonstration package.
Given the number of features common to other existing applications, there could be considerable merit in adapting or "piggy-backing" on such initiatives.
There is also merit in reflecting on the possibility of specifically designing the package as an interface to other packages. In the simplest case it might be of immediate value as an interface through which to order a complex set of word-processing documents that would normally be held in a nested hierarchy of sub- directories.