You could:

• Split your html doc into two DIVs (with mad CSS skills). These are your "two windows".
• Add a javascript (JS) trigger, so that when you click, you display the additional info in the new pane (as well as setting the original pane to what you currently display)

That won't require any CGI, database or anything else. If you already know CSS, JS and DOM then you're probably OK.

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