window count -- return the number of open windows

n = WINDOW COUNT

To get the number n of currently open windows of your application, simply invoke window count.

for i=1 to 10
	window open 10+i*10, 10+i*10 to 200+i*10, 200+i*10, "Win"+str$(i), "Win"
	sleep 0.5
next i

n = window count

while(n>0)
	window close "Win"+str$(n)
	n = window count
	sleep 0.5
wend

This funky program first opens ten windows and then closes them using the window count to obtain the number ID of the last opened window.