I received a question about how to change the left NavBar into an iFrame.
After some experimentation, I have a solution:

if (document.all.tdAreas != null) {
document.all.tdAreas.parentElement.children[0].innerHTML = "<iFrame src = 'http://crm.atechnisch.nl' height = '100%'>";
}

This should also work for other parts of the screen in a similar way.

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