The Control key is used as a modifier for various purposes in different applications. In OS X, it is also used for Emacs bindings supported in many applications. The that is recommended for application developers discourages the use of the Control key (the closest equivalent to the Control modifier key in Windows is the Command key on OS X): As much as possible, avoid using the Control key. Because the Control key is already used by some of the universal access features—as well as in Cocoa text fields where Emacs-style key bindings are often used—it should be used as a modifier key only when necessary. The purpose of access control is to grant entrance to a building or office only to those who are authorized to be there. The deadbolt lock, along with its matching brass key, was the gold standard of access control for many years; however, modern businesses want more.
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March 2019
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