#REDIRECT <PageName>
If this processing instruction appears on the first line of a page the contents of the page will not be shown, instead you will be redirected to the page <PageName>. This is useful because it allows similar pagenames to share the same page content. Redirections are not recursive, only the first redirection will be used.
Example: if you go to WikiSandBox? you will be redirected to SandBox?.
Editing a redirected page is easy. In the above example, after you've been redirected, simply click on the title WikiSandBox? and you're in the edit mode of that page. Click on the "Preview" button if you then want to see the page as it would look like if it wasn't redirected.