InterWiki once was thought as an active connection between all Wikis to form an interchange network of Wiki servers (pages could go anywhere, without letting the user now). As Wiki:InterWiki explains this was to difficult, and today Wikis only use the InterMap to have shortcuts to other Wiki namespaces.

ewiki already supports:

• an InterMap (a small builtin, but an extension list available)
• a PublicallyEditableIntermap
• InterWikiJumping - which suits ewiki for gateway use

it is intended to develop:

• an extension to make use of the MetaWiki: database
• *NearLinks
• *SisterSites and *SisterPages
• collect *InterWikiIcons (only if PublicDomain)

resources:

• *InterWikiSoftware:
• FeatureWiki:CategoryInterWiki

This is useful for example to have an *IntranetWiki and a *PublicWiki for your company, which nicely connect their pages to each other.