Can more than one treeviewnode in a tree be selected at once?

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w=640
h=480
Global window=CreateWindow(PROGRAMTITLE,(ClientWidth(Desktop())-w)/2,(ClientHeight(Desktop())-h)/2,w,h,0)

list=CreateListBox(x,y,ClientWidth(window),ClientHeight(window)-y,window)

hwnd=QueryObject(list,1)
SetWindowLong(hwnd,4,1)
RuntimeError GetWindowLong(hwnd,4)