PENSIZE
Outputs the size of the pen as a two element list containing [Width Height]. The width element is ignored by FMSLogo.
SETPENSIZE [10 20] SHOW PENSIZE [20 20] SETPENSIZE [1 1] SHOW PENSIZE [1 1]
SETPENSIZE [10 20] SHOW PENSIZE
SETPENSIZE [1 1] SHOW PENSIZE