The InterMap (also called InterWiki in some other wikis) is a system for defining links between WikiWikiWeb sites that was first developed by UseMod and Meatball (see UseMod:InterWiki and Meatball:InterWiki). The method is to use a word that stands for a path that is defined. InterMap links have the form MapPrefix:PagePath, where the host prefix is converted to a partial URL based on entries in the site's intermap.txt and localmap.txt files.

The default intermap.txt distributed with PmWiki (in the scripts/ directory) includes the following InterMap entries:

 PmWiki:     http://www.pmwiki.org/wiki/PmWiki/ 
 Cookbook:   http://www.pmwiki.org/wiki/Cookbook/ 
 Wiki:       http://www.c2.com/cgi/wiki? 
 UseMod:     http://www.usemod.com/cgi-bin/wiki.pl? 
 Meatball:   http://www.usemod.com/cgi-bin/mb.pl? 
 Wikipedia:  http://www.wikipedia.com/wiki/ 
 PITS:       http://www.pmwiki.org/PITS/ 
 PmL10n:     http://www.pmwiki.org/wiki/Localization/
 Path:

You can map your own prefixes in your local page Site.InterMap?.

Thus, "PmWiki:Variables" becomes "http://www.pmwiki.org/wiki/PmWiki/" + "Variables," a link to the PmWiki.Variables page on the official PmWiki web site, Wiki:FrontPage is a link to the front page of the first WikiWikiWeb, and Wikipedia:Stonehenge takes you to the Wikipedia article about the famous megaliths in England.

Like other links, you can use the double-bracket syntax to get different link text:

* [[Meatball:StartingPoints | starting
points]] over at Meatball
* [[starting points ->
Meatball:StartingPoints]] over at
Meatball

If you want to link just to what the intermap says (e.g. http://www.wikipedia.com/wiki/ for Wikipedia), then do [[Wikipedia:. | Wikipedia's main page]], which produces Wikipedia's main page. Note the . (period) after the Map: reference.

The special Path: InterMap entry can be used to create "relative urls" in links.

The actual set of InterMap links at any site is defined by the site administrator via the Site.InterMap? page and the local/localmap.txt file; for more details, see PmWiki.CustomInterMaps.