SendBehind
SendBehind Move one window behind an other
#include <Windows.h> Window Manager
void SendBehind( theWindow, behindWin );
WindowPtr theWindow ; window to move
WindowPtr behindWin ; 0=behind all, else= window
SendBehind sends one window behind another specified window or behind all
windows.
theWindow is a WindowPtr identifying the window to move.
behindWin identifies where to put the window. It is one of:
NIL (0) Behind all other windows
else WindowPtr; theWindow will go behind this one
Returns: none

Notes: SendBehind lets you manually organize the windows, changing the
front-to-back ordering to suit your application. Use MoveWindow if you
want to change the physical screen locations.
Don't use this function to deactivate the active window - use
SelectWindow instead. You may shuffle windows onto higher or lower
planes. However, if you need to move a window closer to the front (thereby
exposing more of it), you must make the following low-level calls after
using SendBehind:
wPeek = (WindowPeek) theWindow;
PaintOne( wPeek, wPeek->strucRgn );
CalcVis( wPeek );