essentially you can do it in a couple of ways.
The simplest is to do this in HTML
<a href="thepage.htm" target="_new"> click here to open window</a>
this opens a window that is 400 pixels wide and 300 pixels high. No scrollbars, toolbars, statusbars, not resizeable, nothing. If you don't tell it something in the list of features then it won't turn it on.
Here's a reference on it.