respectively. @code{hchild} is used if the window is subdivided
horizontally by child windows, and @code{vchild} if it is subdivided
vertically. In a live window, only one of @code{hchild}, @code{vchild},
respectively. @code{hchild} is used if the window is subdivided
horizontally by child windows, and @code{vchild} if it is subdivided
vertically. In a live window, only one of @code{hchild}, @code{vchild},