TheseAreSmashedTogether and the page is edited but TheseAreSmashedTogetherToo? haven't been edited yet [If the question mark is present that is]
WordsSmashedTogether denote a page in wiki. Type them and you link to the page. Click on the link and you go there -- or create the page if it doesn't yet exist.
Some times you might want to enter something using WordsSmashedTogether, but not want to create a link. The easiest way is to type an exclamation mark ('!') before the link.
For example, check out the difference between the two lines below:
Scott suggests several ways to "turn off" a Tavi link:
One, in normal text, you can wrap stuff in three backquotes to prevent normal wiki formatting rules. So ThisText wouldn't render as a link. *But*, you should not use this for InterWiki entries, since 'Tavi expects the text for them to be alphanumeric (IIRC).
On the other hand, you can disable the linkifying of *all* CamelCase WikiNames by setting $EnableWikiLinks to 0. Then, you will have to enclose text in double parentheses for it to link, even if it's a normal WikiName. Perhaps this is too stringent for what you want...
Lastly, you can put all your InterWiki tags in lowercase. Since MySQL seems to be case insensitive, if your InterWiki tag reads 'phpwiki' and your prefix elsewhere reads 'PhPwIkI:SomePage', it will still pull up the right entry from the database. So if you put 'em in lowercase they'll still be useable, but they won't appear on WantedPages (which may be what you want).
Placing four or six single quotes between the words (see MSExploder example above) also seems to work.