Clear the screen and return the cursor home
CLEAR [SCREEN] | CLS
SCREEN suppresses the automatic releasing of Get objects from the current and visible GetList array when the screen is CLEARed.
CLEAR is a full-screen command that erases the screen, releases pending GETs, and positions the cursor at row and column zero. If the SCREEN clause is specified, Get objects are not released.
CLS is a synonym for CLEAR SCREEN.
. SET KEY and VALID: If you are editing GETs, executing a CLEAR within a SET KEY procedure or within a VALID user-defined function will abort the active READ when control returns. To clear the screen without CLEARing GETs, use either the CLEAR SCREEN or CLS commands.
@…CLEAR, CLEAR GETS, SCROLL()