DISPLAY [-tree] [-x] variable-name
display a variable [tree: display as a tree] [-x: display as hexadecimal string]

DISPLAY {control-name}   {PROP}     property-name
        {control-handle} {PROPERTY}
        {window-handle}
display a property of a screen control or window

DISPLAY -env env-name
display an environment variable

DISPLAY -classversion
display the isCOBOL version of the current program