HJG I know these variations:

• Link to an external webpage: just write the url: http://www.google.com/
• Link to an external webpage without showing the link: write the url in square brackets: [1]. This is nice for really long links like [2] - Amazon: "Practical Programming in Tcl and Tk (4th Edition)"
• Link within the wiki to a specific wiki page: put name of page in square brackets: How do Wiki Categories work
• Link within the wiki to a specific wiki page, showing square brackets: [Wikit Problems] - use triple square brackets
• Link within the wiki to a wiki page, without getting a backlink: http://wiki.tcl.tk/2272 = [Category Application]
• External link to a wiki page by number - http://wiki.tcl.tk/149
• External link to a wiki page by name - http://wiki.tcl.tk/How+to+link+to+a+page
• At one time, one could write this as http://wiki.tcl.tk/HowToLinkToAPage . It still sometimes works
• One can link to a group of pages by specifying a word in a title, such as http://wiki.tcl.tk/link .
• One can also link to a group of pages by specifying a word in a page, such as http://wiki.tcl.tk/external*

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