[Cuis-dev] toggling full screen mode

[Mark Volkmann]

I was looking for a way to detect if Cuis Smalltalk is in full screen mode.
I see that the `DisplayScreen` class has this instance method for changing
it:

fullScreenMode: aBoolean
    "On platforms that support it, set full-screen mode to the value of the
argument. (Note: you'll need to restore the Display after calling this
primitive."
    "Display fullScreenMode: true. Display newDepth: Display depth"

    <primitive: 233>
    self primitiveFailed

This is the first time I've encountered the `<primitive: someNumber>`
syntax.
Where can I learn about what that does?

-- 
R. Mark Volkmann
Object Computing, Inc.
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