delAllDisplays() | 
Delete and close all known displays | 
getDefaultBackend() | 
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getDefaultFrame() | 
Get the default frame for display | 
getDisplay([frame, backend, create, verbose]) | 
Return a specific Display, creating it if need be | 
h_callback(k, x, y) | 
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incrDefaultFrame() | 
Increment the default frame for display | 
noop_callback(k, x, y) | 
Callback function | 
setDefaultBackend(backend) | 
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setDefaultFrame([frame]) | 
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setDefaultMaskPlaneColor([name, color]) | 
Set the default mapping from mask plane names to colors | 
setDefaultMaskTransparency([…]) | 
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