MacHack, the “Advanced Developers Hands-On Conference,” today announced new one-day training sessions to be held on Wednesday, June 18. The intensive training sessions — Cocoa Software Development and Tcl/Tk — are designed to complement MacHack’s three days of presentations and papers. The Cocoa training, which will be lead by veteran Mac developer Chris Hanson, covers the full spectrum of Cocoa development, from the declaration of classes and NSObject, all the way to advanced UI elements and concepts, and will include lab exercises to allow attendees to understand the architecture from experience.