8. The system of claim 6 , wherein assembling the portion of the graphical user interface script by generating in the graphical user interface script the call to each pre-scripted part in the set of pre-scripted parts includes replacing in the graphical user interface script a pre-scripted part with another pre-scripted part to form a new version of the graphical user interface script.
8. The system of claim 6 , wherein assembling the portion of the graphical user interface script by generating in the graphical user interface script the call to each pre-scripted part in the set of pre-scripted parts includes replacing in the graphical user interface script a pre-scripted part with another pre-scripted part to form a new version of the graphical user interface script. 9. The system of claim 8 , further comprising storage for storing multiple versions of the graphical user interface script for subsequent retrieval.