The WSHOW procedure exposes or hides the designated window.
The window index of the window to be hidden or exposed. If this argument is not specified, the current window is assumed. If this index is the window ID of a draw widget, the widget base associated with that drawable is brought to the front of the screen.
Under windowing systems, iconification is the task of the window manager, and client applications such as IDL have no direct control over it. The ICONIC keyword serves as a hint to the window manager, which is free to iconify the window or ignore the request as it sees fit.