Layout Master provides two kinds of previewing. Manual previewing when you want it, and Live previewing (currently in the Macintosh only). The advantage of Live previewing is that you see the effects of your changes almost instantaneously in the browser or browsers you want as soon as you make them. In addition, as we saw above, there is a WYSIWYG editing mode (currently Macintosh only). While this does not reproduce exactly what you see in a web browser, it allows for easier editing when fine tuning is important.
Of course you'll want to preview your layouts in various browsers. When you first run Layout Master the application finds any copies of Internet Explorer or Netscape Navigator, versions 4 or higher and adds them tot he list of preview browsers list in the Preview in Browser submenu of the Preview menu. So you should be able to just choose one of these browsers and launch it to preview straight away.
You may however at some stage wish to modify this list of preview browsers.
To add or remove web browsers to or from the list of preview web browsers
1. choose from the menu (it's a submenu of the menu item)
the Edit Browser List window opens
figure 16: Edit Browser List window
2. click , then locate and select the browser application you want to add to the list
3. select a browser from the list and click to remove it from the list
4. click to close the window
The browsers that you have selected now appear in the submenu of the menu.
Next we'll want to preview in our chosen browsers.
To preview in our chosen browsers
1. choose from the menu
This will preview the current layout in any of the preview browsers currently open. If you want to open a preview browser, or simply to preview in a particular browser, you can do this too.
To preview in a particular browser (Layout Master will launch it if necessary)
1. choose the name of the browser in the submenu of the menu
To preview a layout in all the preview browsers currently running
1. click the Preview Now button 
in the launcher
To set up live previewing
1. choose from the menu
Layout Master will update your preview in every selected browser currently running every time you change the layout.
