msos2.hlp (Table of Contents; Topic list)
WS_SAVEBITS
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WS_SAVEBITS  Saves the image under the window as a bitmap. When the user
hides or moves the window, the system restores the image by copying the
bits; there is no need to add the area to the uncovered window's update
region. Because this operation can consume a great deal of memory, it is
recommended only for transient windows such as menus and dialog boxes, not
for main application windows.
 
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