This video, via LiineTV, looks at how to use WiFI MIDI with a Mac computer, specifically with the Lemur iPad app.

via LiineTV:

How do I use Lemur as MIDI controller?
– Connect to the wireless network from your iPad.
– Launch Lemur Daemon.
– Set the MIDI targets in the Lemur from the Settings page.
– Load a template.

Connect with the Lemur community – http://www.liine.net