I think you want to check out
SSI then:
The decision of when to use SSI, and when to have your page entirely generated by some program, is usually a matter of how much of the page is static, and how much needs to be recalculated every time the page is served. SSI is a great way to add small pieces of information, such as the current time. But if a majority of your page is being generated at the time that it is served, you need to look for some other solution.
Or even some JavaScript might do *shrug*
"Just because you have not felt the need for it does not mean that it is not desirable..."
Oh most certainly not :) If the case was wheter I felt a need for something to allow something's existence, the world'd be pretty boring :)