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The PARIS Designer32 Reference Manual
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A Change Page Definition event is used to change the page definition for the current
page under certain conditions.
When would I use a Change Page Definition
event?
The Change Page Definition event is a very useful and powerful feature in PARIS.
The page definition contains most of the important settings for the page and the
Change Page Definition event gives you the ability to dynamically change the
settings.
For example:
A simple example of where this is useful is a multi-page statement. Using
a Change Page Definition event, you could set up a test for the string
‘Page 1’ and whenever the test is true, it calls in the page definition for
Page 1. When the test is no longer satisfied (e.g. on Page 2, Page 3 and so
on), it would revert to the page definition in the Print Order.
The page definition for Page 1 could be landscape orientation, printing on
letterhead stock from tray 1, while the page definitions for the 
remaining
pages could be portrait orientation printing on stock from tray 2.