Format: SET CASE { UPPER | LOWER | NONE }

 Use the SET CASE (abbreviated SE CA) command on terminals which are
 capable of displaying uppercase characters only.  SET CASE instructs EDT
 to flag with a preceding apostrophe either the uppercase characters, the
 lowercase characters, or neither.  The default for SET CASE is NONE,
 which means no characters are flagged.

 You can abbreviate the keywords as follows:

     CASE    CA
     UPPER   U
     LOWER   L
     NONE    N