I should put some help text here. Right now there's nothing.
Using the double brackets around things is what creates those interesting links.
Describing an external URL is done by enclosing it in double brackets, and then a space and then your smart words, like:
<nowiki>[is a fine website]</nowiki>
That gives: [Ruk.ca is a fine website]
[_pw2_] phentermine online hydrocodone buy hydrocodone online buy phentermine cheap phentermine cheap viagra buy viagra viagra online cialis online buy cialis buy tramadol tramadol online carisoprodol online phentermine online hydrocodone online viagra online tramadol online tramadol online hydrocodone online cialis online viagra online phentermine online phentermine online viagra online hydrocodone online tramadol online