V1[]
Indications are, GBOX and GFILL in SmileBasic V1 are identical to those in V2.
V2[]
GBOX and GFILL are very similar statements; the first draws the outline, 1 pixel wide, of a rectangle, and the second fills a rectangle. The rectangle is drawn on the currently selected graphics page.
If given 4 parameters, x1, y1, x2, y2, the corners of the rectangle will be at coordinates (x1,y1), (x1,y2), (x2,y2), and (x2,y1).
If given 5 parameters, the first 4 will be as above, and the fifth will be the colour the rectangle is drawn in. If the fifth parameter is omitted, the currently selected colour is used.
V3[]
No information on SmileBasic V3.