Exposes or hides the designated window.
show (optional) A flag indicating whether a window is hidden or exposed:
UNIX and OpenVMS Users: The definition of "hidden" is machine-dependent. On Sun Workstations, for example, the window disappears, although it can still be written to if it is the active window. On machines supporting the X Window System server, the window is simply pushed to the back of the window display list so that it appears to be located behind other windows on the display.