[ic] How to override existing [shipping] and [total-cost] tags ?

[Guido Sohne <caught_one@yahoo.com>]

I've created a UserTag called [deliverycharge] that iterates over the
shopping cart and calculates a delivery charge. 

Now, how do I override the [shipping] and [total-cost] tags so that the
figures are correct and minimal changes would be necessary to ITL code
?

If I override the [shipping] tag (which I have not yet figured out how
to do), will the [total-cost] value reflect the new logic for shipping
?

I would be interested in finding out the various ways in which this can
be done.

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