Count Size of Output Area

Returns the current size of the output area and the number of bytes already written there.

1 W3WRITTEN (I4) /* o/m : Currently written bytes
1 W3MAXPAGE (I4) /* o/m : Maximum bytes possible
1 W3FREE    (I4) /* o/m : Free bytes

PERFORM W3COUNTER W3WRITTEN W3MAXPAGE W3FREE