| In Citect for Windows versions 1.xx and
2.xx the ANs 1 to 20 where reserved to display various pieces of
standard information. This included the time, date, alarms banners,
prompt, keyboard echo, page name, page title and some default
buttons. This gave you a basic set of features for all of your
pages. These ANs where animated by the function _PageDefDisplay()
in the file PAGE.CI in the INCLUDE project. This function would get
the required information and display it on all pages.
With the new features in version 3.00 this way of providing you
with a basic set of features for all you pages has been moved in to
the templates. Putting these features into the templates makes it
easer for you to customise this information. For example if you
don't want the time and date on just a few pages you may create a
new template without the time and date. Then the time and data will
still be displayed on all your other pages. ANs 1 and 2 are still
reserved as this information is displayed direct from Citect and
not via animation.
To make Citect version 3.0 backward compatible with versions
1.xx and 2.xx pages, Citect must still update the reserved ANs on
pages created in these versions. If however you create a new page
in version 3.0, Citect must not display this information. To
implement this Citect needs some way to know if it must display the
information. To support this requirement a Page Environment
variable is added to all version 1.xx and 2.xx pages when they are
converted to version 3.0. This page environment variable is called
"PageCicodeOn" and is set to 1. When Citect sees this page
environment variable attached to a page then it will display the
information on the reserved ANs 1 to 20. If this page environment
variable does not exist or is set to 0 then the information is not
displayed.
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