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713 bytes added, 23:45, 25 January 2011
copy/paste from Wikipedia (most relevant part of a documentation page)
This is an auxiliary [[Help:Template|template]] that allows one to encode "<code>||</code>" (two pipes or [[vertical bar]]s) within template parameters. If it is '''unnecessary''' to get a "<code>||</code>", it is better to use "<code>&amp;#124;&amp;#124;</code>". However the "<code>||</code>" delimiter for a [[Wikipedia:How to use tables|Wiki table]] has to be escaped by a template if it is used within a template.

There is no such problem with "<code>!!</code>" (exclamation marks). This problem only affects "<code>||</code>" (vertical bars) in conjunction with the [[m:Help:Parameter default]] mechanism within tables.

This template cannot be [[Wikipedia:Template substitution|substituted]].