For me it was an Atari Falcon030 with some text editor I can't remember the name of open in one window, and the browser (CAB?) open in another window. When I saved the editor, the browser updated the view without me having to switch windows. Very handy for tweaking.

I was forced to use Frontpage a few times but it was so cumbersome when you were used to programming so I gave up fast and went back to text editors. PSPad and Netbeans lately.