StickyKeys
From ctowiki
StickyKeys is an accessibility application for Microsoft Windows operating systems. This program will hold CTRL, ALT, and/or Shift keys when they are pressed. For example, if StickyKeys was enabled and a user needed to press CTRL+P, they can simply tap CTRL and then tap P, instead of holding one and pressing the other.
Enabling/Disabling StickyKeys
By default, a user can tap the Shift key 5 times in a row. A dialog box will appear, allowing the user to turn on or off StickyKeys.