When you build a page group, each page you add is wrapped in an <IFRAME> tag, which allows the page to display on a page group tab and not pop-up in a separate browser window.
<IFRAME> creates a frame that sits in the middle
of a regular nonframed Web page. <IFRAME> works like <IMG>,
only instead of putting a picture on the page, it puts another Web
page on the page
Versions of Netscape prior to 6.0 do not support the <IFRAME> tag.
The number of IFRAMEs (pages) contained in a page group is saved in the portal database column of the page group (tabsets) table. When multiple page groups exist with different values for the number of pages, the portal uses the maximum number of pages specified and uses that number for that log in session. If the maximum number of pages is more than the number of pages in a particular page group, some pages are left unused. However, if the maximum number of pages is less than the number of pages in a particular page group, it is possible that more than one page will share an IFRAME and switching between those pages will cause pages to reload.
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