How to change font size in a Micros 3700 ISL script

I was wondering if anyone knew the comand to change the font size on an ISL script for Micros 3700 4x. I will list the ISL below but what it does is creates a window on the POS terminals that tells the cashier the change to give but we would like to increase the font size and color if possible. ISL script in txt file below..thanks in advance

//This sim displays the change due in a window until the user presses clear
//Replace the 101 with the tender key number of the tender this will be linked to
//Make sure the window does not cover your clear button or there will be no way out

event tmed : 1


var change :A32 //Print String


format change as "$",(@tndttl - @ttldue)

window 10, 50, "CHANGE DUE"
display 3,@center,"Change Due Is..."
display 4,@center,change
display 6,@center, "Press CLEAR to continue."
waitforclear
windowclose

endevent