Both windows and pixmaps can be used as sources and destinations in graphics operations. These are collectively known as drawables. The following functions apply to both windows and pixmaps.
| drawable-display | drawable | Function | 
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 Returns the display for the specified drawable. | 
| drawable-equal | drawable-1 drawable-2 | Function | 
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 Returns true if the two arguments refer to the same server resource, and nil if they do not. | 
| drawable-id | drawable | Function | 
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 Returns the unique resource ID assigned to the specified drawable. 
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