You can create a plugin to MsnPlus ... (a plugin for a plugin) and interact with some features of MSN

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The Messenger Plus! Plugin API

Developers can create their own plugins for Messenger Plus!. The plugin API is here to help you easily create new commands, new tags, and new features for MSN Messenger and Windows Messenger.

Click here to download the Messenger Plus! API documentation

If you need assistance, please visit the plugins section of the forum.
Did you know? your plug-in features can use Messenger Plus! commands (to send a file for example). Click here to see the full list of supported commands.