By now, you're probably wondering what a lot of these options do. Texx can display your document at two different sizes, Normal and Large. These two sizes are used for viewing the overall structure of the document and checking detailed structure, respectively. In Normal mode, you will normally have two leaves on your display simultaneously. Two adjacent pages of your DVI file are displayed in these leaves. To make the image so small, texx shrinks the fonts and scales everything down to size. This is where the blackness parameter comes in---you can control the shrinking algorithm to some extent. The default values for NormalShrink and LargeShrink are determined by the size of your display and the number of leaves you specify (2 is the default, unless the DVI file contains only one page), so you normally don't need to specify them yourself. Similarly, TopMargin, SideMargin, and Dpi will default to reasonable values, so you normally don't need to worry about any of these options except perhaps -rv.
When texx starts up, it will be in Normal mode, and you'll normally see two leaves of your document, containing the first two pages of your DVI file. To go to the next page, just type Return. This will move page 2 to the left leaf, and put page 3 in the right leaf. Typing ``-Return'', or Delete, or Backspace, will move back one page. Typing a number followed by one of these keys will go that many pages in the indicated direction.
To see one of the pages in Large mode, put the mouse on top of the text to be displayed and hold down any mouse button. The cursor will turn to an clock while the enlarged image is being computed. Once it has been completely computed, the enlarged image will be displayed, taking up the entire texx window (or only one leaf, if two leaves are in use). Release the button to go back to Normal mode. Once the enlarged image for the pages on display have been computed, they are retained, so you can switch quickly between the Normal and Large modes. Once a page is not being displayed in either leaf, however, its enlarged image is also discarded, so if you come back to it, its normal and enlarged images will have to be recomputed.
To move around in the DVI file, you can also go to absolute page numbers by typing the number of the page followed by the letter ``g''. Typing ``q'' will exit texx.
You can ``reload'' the DVI file by pressing R. This saves time when you're intensively editing a document.