Document processing devices and account manager systems are presented which verify validity of pairings of installed consumables and document processing devices for permissive enablement of document processing functionality based on validity of the pairings. The contact module includes a shell, a first contact terminal and a second contact terminal both received in the shell. The said ent-kaurene diterpene compound could be condensed with hydroxyl compounds to obtain various acetal derivatives, could be reacted with amine compounds to obtain various amino derivatives, and could be reacted with acyl halide or acid anhydride to obtain various acyl derivatives. The strings are typically linked in parallel to a combiner box, and then toward and enhanced inverter module, which is typically connected to a power grid. They also have various personal care applications, especially in oral hygiene, and can be used in food applications. In particular, dynamically-modifiable mapping data structures are used to interface multiple software development environments with one another, such that modifications may be made to such data structures in response to modifications made in the underlying software development environments and thereby maintain interoperability between such software development environments.