Normally you are unable to embed more than one view on a form you show the user in the browser.
This is an easy way to show more then one view. When you have this, it is easy to replace the SRC of the Iframe to show another view or another single category to the user based on his selection/actions through the Iframe object methods.
Create a table with one row and two columns
In column 1: <IFRAME id="myFrame" SRC="JustAView1?openview"></IFRAME> In column 2: <IFRAME id="myFrame2" SRC="JustAView2?openview"></IFRAME>