Here's some basic info to get you started:
The software program that you are using right now (Netscape Navigator, Internet Explorer, Opera, etc.) is called your browser. It's the software with which you browse (or, explore) the Web.
When you browse the Web, you go to different web sites. Web sites may have only one page, but usually they consist of many pages.
The rectangle that you are looking at right now is called a window. At the top of this window, you have a menubar (with menus like "File", "Edit", etc.), and you also may have buttons to do various things (go back, go forward, stop, etc.). Through this window, you are seeing a page from this web site. This page is the "Navegación" page.
To get from one page to another, you click on links. Underlined words tend to be links; many times pictures are links, too. When you pass your mouse over a link, you'll notice that the cursor or arrow changes to something else (often, a little hand). This little link, for example, will take you to the bottom of this page. Press the button on your mouse to click on the link (for PCs, use the left button).
When you click on a link, you are requesting to go somewhere new; it may be another place on the same page, but, generally, it's a new page. If it's a new page, two things can happen: either the new page will appear in the same browser window, or it will appear in a separate browser window.
When a new page appears in the same window, the page that you were on disappears. When you're done with the new page, you'll either choose a new link (to go to a third page), or you may want to go back to the first page. To get back to the first page, you need to use the "Back" button (which may be a left-handed arrow) by the menubar of your browser. There may also be a "Back" button on the page itself. Try this now by clicking here.
When a new page appears in a new window, the page that you were on stays around in the first window (but, now, it's behind the second window). When you're done with this page, you'll either choose a new link (to go to a third page), or you may want to go back to the first page. In either case, you may want to close the new window. This is usually done by clicking on a little square in the corner of your browser window, or there may be a "Close window" command on the page itself. Try this now by clicking here.
Before coming to this navigation page, you were on the welcome page. You clicked where it said "Click here for some tips on navigating." (Specifically, you clicked on the underlined words 'Click here', which was a link). A new window appeared with this navigation page. But, you'll notice that the welcome page is still around; it's just in another window behind this window. If you click anywhere on that window, it will bring it to the front.
If this page didn't have any other links on it, the only thing you'd want to do with this page at this point is to close it. (You can do that by clicking in the little corner box on your browser, or by clicking here, on the word "cerrar".
But, there are other links: if you want more of an introduction to the Internet and navigation, click on either of the following links.
Notice that clicking on either of these two links will cause a new browser window to open. Thus, this window, as well as the first window with the welcome page, will still be around in the background.
(Here's the bottom of the page)