From Annie Hall's GardenDesigns.com

Obtaining the Pm Wiki version

Use the {$Version} page variable to display the current version of Pm Wiki.

See the SiteAdmin.Status page for the current version and version number.

For example

This wiki installation is running PmWiki {$Version}, version number
{$VersionNum}.
-<The default group is {$DefaultGroup}.
-<The default name is {$DefaultName}.
-<The site group is {$SiteGroup}

See also basic variables.

The script version.php contains the declaration of the version number.

Obtaining recipe versions

The Site Analyzer can be used to display the current version of Cookbook recipes.

See also Cookbook:RecipeCheck