Sharing field text

[Graham Samuel]

As usual, a dumb question: how can I share a field with many cards so 
that the text in the field only has to be altered by a script 
changing one of the cards to make the altered text turn up in all of 
them? I thought the 'share text on each card' checkbox in the 
Properties Palette would do it, but it doesn't. I guess I am looking 
for 'true' background behaviour, but I am not concerned with groups 
here.

Or is it just impossible - of course I can achieve the same result by 
scripting, but that seems wasteful.

TIA

Graham
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          Graham Samuel / The Living Fossil Co. / UK & France