The frameset defines each frame's size, name, and contents. Each frameset can define a group of vertical frames or a group of horizontal frames. Framesets can be nested within each other, which is how you create a page with both horizontal and vertical divisions. You can tell different files to display in a specific frame within the frameset. Before you start typing frame commands and building a framed page, take a few moments to really look at the components of your site.
Some people find it helpful to make an outline or a list.
If you've done print design, building a frameset is a little like building a grid. It defines the underlying structure within which information will be displayed. Or, if you've done any gardening, it's a little like setting up a flowerbed into which different flowers will appear in different sections throughout the year. The success of your overall website is related to your underlying presentation structure, so think about your frames carefully. The best uses of frames are relatively simple designs.