Using frameset using single page with PHP

admin.php using a page left menu right content
not as below

<frameset cols="30%, 70%">
<frame src="menu.php">
<frame src="content.php" name="content">

I’m a licensed user of vBulletin
I see what you did with an index.php page in the admin CP section
However, I did not understand how it did, How is this done?

Screenshot of the vBulletin Admin Panel

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