Create a card as the last card in stack A. This card can be either all
black, all white, or the same background as the rest of the stack with
blank field data.
To get the visual effect to work, the script would read:
on mouseUp
visual effect -- whatever
go last card -- of stack A
go stack B
end mouseUp
The visual effect works because it is going between two cards in the same
stack, and then the change to the new stack appears to occur
instantaneously after the visual. If the last card created is a solid
color, it will give the appearance of a "fade to black or white" or open to
"white or black" and can work really dramatically.
If the last card has the same background, it will look like the data from
the fields disappears and then you're in stack B.
This article is adapted from the Claris Tech Info database.