MercutioHUnlockPatch is a "free" system exension by Brian Zuk which is installed by theRAM Charger installer to fix a common problem that crashes many Macintoshes. Many popular Macintosh applications incorperate a "canned" package of software, known as Mercutio MDEF, that allows developers to easily and elegantly extend the power of their application menus. It was discovered that applications that use pre-version 1.5 of this package were crashing systems as a result of a bug in Mercutio MDEF. Although this problem has surfaced because of a bug in the Mercutio MDEF package, Apple reports that there are other (non-Mercutio) applications, and even parts of the OS, that can cause the crash.
