DATA PROCESSING APPARATUS

A data processing apparatus comprises apparatus arranged to model a number of modules (302,314) with each module containing a number of interconnected behaviours (320-325). A behaviour identified as a marker (304) is able to access a behaviour (321) within another module via an identify link (306) and from information denoting that behaviour within a look-up table (312) held in a further behaviour (310). Having established access, a direct identify link (316) can be set up between the selected behaviour (321) and a nominated behaviour (318) within the module containing the marker. This direct identify link is maintained when the identify link between the marker and the further behaviour is terminated, allowing the marker to go on and establish other direct links (330) to the internal behaviours of other modules (336).