Microsoft-style bars are physically located in the same window as the content they are associated with. However, Bruce Tognazzini, former employee of Apple Inc. and Human–computer interaction professional, claims that the Mac OS's menu bars can be accessed up to five times faster due to Fitts's law: because the menu bar lies on a screen edge, it effectively has an infinite height — Mac users can just "throw" their mouse pointers toward the top of the screen with the assurance that it will never overshoot the menu bar and disappear.