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Introduction to the SAP BDT - Business data toolset
The Business data toolset (BDT) is a central control tool for maintaining SAP programs. It supports maintenance via the use of dialog techniques, direct input and/or function modules. The BDT is basically the tool SAP use when they want to add new fields, change field names, change/add field groups etc for specific customers, but they are now starting to allow there customers access to these maintenance transactions (i think mainly ramp-up customers at the moment). Example use of the BDT can be found here where it demonstrates how the BDT can be used to modify the grants management master data transaction.