An example would be if I kept the same table of links to outside news articles on every page of my site. I want to be able to change the content in that table once and have it reflect on every single page of the site (or whatever pages I specify).
I tried searching around for "automatic web site update" and the like but found nothing much. This must be a fairly popular utility but I have no idea what to call it.
SSI are defintely a better content management tool. However if you are coming into an existing project where thats not an option I know homesite has a "replace in files" tool. Be very, very, very careful using it though it's really, really, really easy to mess something up. I had a ...umm.. friend, yea thats it a friend... inadvertantly mess up almost a 100 files he didn't mean too.