3. Apparatus as claimed in claim 1, wherein said first memory means has stored therein at least one further group of agents being an operator agent, said operator agent being arranged to carry out a selected one of two or more procedural steps, with the selection being made within the operator agent on the basis of one or more external factors, and the selection operation within the operator agent is triggered prior to the enablement of a script agent carrying a marker identifying the operator agent, and subsequent to enablement of a preceding script agent of the sequence.
3. Apparatus as claimed in claim 1, wherein said first memory means has stored therein at least one further group of agents being an operator agent, said operator agent being arranged to carry out a selected one of two or more procedural steps, with the selection being made within the operator agent on the basis of one or more external factors, and the selection operation within the operator agent is triggered prior to the enablement of a script agent carrying a marker identifying the operator agent, and subsequent to enablement of a preceding script agent of the sequence. 4. Apparatus as claimed in claim 3, wherein one or more stored object associated qualifier terms is controllably varied by one of said operator agents during sequential enablement of said script agents.