HiliteWindow
HiliteWindow lets you manually highlight or unhighlight a window; that is, make the title bar white, dim the scroll bars, erase the grow icon, etc.
OnOffFlag is a Boolean value specifying which action to take. It may be one of: TRUE Highlight the window FALSE Unhighlight the window
Notes: The highlighting/unhighlighting is performed by the window definition
function that varies for each window type. On windows having a grow icon:
this does not redraw the grow box in its new state, but the next time you
call DrawGrowIcon, it will be shown with its correct highlighting. This function is used rarely since SelectWindow takes care of window highlighting.