There are two ways to have a particular page appear in the right-side IFrame. You can either call the page that is encoded in the XML file by using its <div>'s ID attribute or you can call any wiki page by using the pages public URL without the prefix "https://collab.itc.virginia.edu/access".
If the page is part of the XML hierarchy in the toolbox.xml file, then you can use that <div>'s ID attribute in the URL by appending "?id=thdl####" to the Toolbox's URL. For instance, the ID for the <div> for "Creating Instructional Units" is "thdl1173728163652". To link to the Toolbox and have that page appear, the URL would be www.thdl.org/tools/toolbox/index.php?id=thdl1173728163652. The same applies to any page encoded in the XML hierarchy.