8. A local database system, wherein the local database system is configured to connect with a main database system via a first network connection, the main database system and the local database system being separated by a first firewall, the local database system being further configured to connect to a handheld telecommunications device via a digital mobile telecommunication connection, the local database system and the handheld telecommunications device being separated by a second firewall, the digital mobile telecommunication connection tunneling through the second firewall, the local database system comprises: a memory configured to store machine executable instructions; and at least one processor configured to execute the machine executable instructions to create a local database instance, receive user permissions from the main database system through a database tunnel implemented using the first network connection, the database tunnel tunneling through the first firewall, receive a portion of a document database via the database tunnel, receive a request for a user document from the handheld telecommunications device via the digital mobile telecommunication connection, map the portion into the user document, send the user document to the handheld telecommunications device via the digital mobile telecommunication connection, the handheld telecommunications device including an application program configured to display or modify the user document, receive a modified document from the handheld telecommunications device via the digital mobile telecommunication connection, the modified document including a modification request specifying a modification of the portion, extract the modification request from the modified document, forward the modification request to the main database system via the database tunnel only if the modification request is allowed by the user permissions, and synchronize the local database instance with the document database through the database tunnel.
9. The local database system of claim 8 , wherein the extraction of the modification request includes comparing the user document to the modified document.