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Include It is a little old. Consider to use Include Me instead.

Include It is a plugin that permits the inclusion, in a post or in a page, of any type of file (even a php script that will be executed). I use it to write some functionalities needed in some pages, without creating special template pages (that are theme dependant) and without using a "php code executor".

The inclusion can be forced to be within an IFRAME html tag.

See the options page of the plugin for a deeper explanation and how to use it and the plugin page: http://www.satollo.net/plugins/include-it.