Systems and methods are provided for data processing. In one implementation, a data processing system includes storage means for storing sets of account identifiers, each of the sets of account identifiers being assigned a set of control parameters. The data processing system may also include an account management system that stores account data of accounts that are identified by the account identifiers, interface means coupled to the account management system, and one or more sets of application programs that are adapted to process account data of accounts identified by at least one of the one or more sets of account identifiers using the set of control parameters assigned to the at least one of the one or more sets of account identifiers. The interface means may obtain the account data from the account management system on request of one of the application programs.