Netscape Browser allows you to look at files that have the extenders .htm, .html, .jpg, or .gif (caps are o.k. here, so long as they match the actual file name). These files might be on another server, in another country; or they might be files that someone just mailed to you and that were deposited on your hard drive; or they might be files you created and named with these extenders, and saved on a floppy diskette.
 
Netscape Composer allows you to create and edit .htm or .html files.  The files will look a bit different in the Composer from the intended finished product, so you should use the Browser to examine your work frequently, particularly to adjust the position of images.

Open the File menu of your Netscape Browser. The first item is "New" and it allows you to open a second Netscape Browser window, so that you can view 2 different websites at the same time. It also allows you to create a Blank Page; this will open a new, blank page for you to work on in the Composer.

The File menu also has the option "Open Page."  This lets you open, in either the Composer or the Browser, any local file (on your hard drive or on a floppy).

Yet another option is "Edit Page." This will open in the Composer a copy of the page you are currently viewing in the Browser. If it is a webpage (as opposed to a local file), you will be warned that you should get the owner's permission to download a copy of the page. This is handy for (1) getting a quick copy of your own page to edit, or (2) examining and maybe swiping part of the structure of a page you admire. If you like the way a page is set up, you can change the contents and the name and make it a page of your own. However, you should ask for permission if the copying is substantial.