When there are many child windows, it's hard to tell which window is active.
A magenta frame is added around active window title bar
@AWI = 0; // No Indicator
@AWI = 1; // default, solid line, outside window frame
@AWI=2;; // title bar frame
@AWI=3; // title bar top line
and add 4 to use thin line
and add 8 to use dashed line
@AWI=9; // thick dashed line, window frame
@AWC is for indicator color as an RGB integer.