the application can make use of two way communication as explained elsewhere herein a building blocks are each supplied with their own unique identity one can build various constructions interactively receiving computer guidance during the course of building b the building blocks are each supplied with a wireless terminal and a unique identity command and control gloves for virtual reality or like games each limb of the glove is provided with position location ability according to the above embodiments in accordance with the present embodiments such positioning ability can be provided simply by attaching a sensor to the end of each finger of a regular glove thus each finger is provided with separate positioning ability to be read as desired by the game application alternatively or additionally rings on the fingers may provide wireless terminals or straps may be applied on any part of the body of the user or on items or accessories used in the game reference is now made to fig1 which is a simplified diagram illustrating an inventory system according to an embodiment of the present invention positional elements are embedded in items of stock 140 it is desired to inventory and a base station 142 is provided in the premises to track movement such a system is advantageous in tracking stock that moves frequently and for which updated information is needed reference is now made.