Basically, I ended up doing this:
EXEC_SCRIPT 'window.close ();'
That closed my newly opened browser tab the Landing Page appeared in after the user clicks on a link from the company's main website.
(Customer wants to request data, click on a link on Company Website, Aware page opens in new Tab via URL login to a VP, Form collects data, Save button saves form and runs Process to display Thank You, then closes the new Tab.)
Looked great, until I tried it on my iPad and the tab didn't close.
Decided to DISPLAY LAYOUT xxx from VP_xxx using static HTML, that says thanks, with a button that DISPLAY URL to Company Homepage.
User can then close the tab or continue if they wish.