An information service provides search and notifications to inform when certain people are nearby so as to facilitate communications with those people. The invention particularly relates to a sales and marketing method for publishing clothing, accessory, and furniture etc. The data integrity validation rules are stored in a knowledge base which is separate from and external to the data integrity validation application. The MPCs are formed by methods of electrified jetting of polymers. The nulling antenna is oriented to place a null in a direction of a desired communication signal and the controller subtracts a processed secondary signal from a processed wideband primary signal to produce a jamming cancelled signal.