With the examples window open, type and execute:
window.hide ("examples");
clock.waitSeconds (3); ´ So you can see the effect
window.show ("examples")
» true
The window "flashes" as it is hidden and then shown again.
With the examples window open and all of its contained objects' windows closed, type and execute:
window.show (@examples.picture)
» false
The window wasn't open, therefore could not be hidden or shown. The verb, therefore, returns false.