Candy,
I tried to do what you are trying to achieve when I first got my hands on Genero many years ago.
This was for at various times to differentiate between live and test, between many sites in a development environment, or for users running two or more companies, or in two or more countries. Alternatives we came up with included...
using ui.Interface.setImage to change the GDC logo
using presentation styles to change the background colours of the window i.e grey for New Zealand, yellow for Australia
using ui.Interface.setName or ui.Interface.setText
but what we ran with was changing the text attribute of the Windows node, ui.Window.setText to provide the user with the info as to what environment they were running
Hope that helps,
Reuben