This variable is related to the terminal manager KEYSTROKE EDIT=ALT method of requiring users to press the Alt key along with the key letter to move to a new control. In character mode and when accepting a push-button, check box, or radial button, the runtime's default behavior is to terminate the accept if the key letter of a control is pressed, and move to that control. See The KEYSTROKE Variable for more information.
This behavior can be changed by setting NO-BARE-KEY-LETTERS to TRUE. When set to TRUE, in order to move to these types of controls, users will be required to press the key set by the KEYSTROKE setting EDIT=ALT before pressing a key letter of that control. The default setting is FALSE, which uses the behavior described in the previous paragraph.