xel to copy to
<br />
dest_buffer (optional) - name of buffer to copy to, e.g. BackBuffer()
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<h1>Description</h1>
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<td>
IMPORTANT: 

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You *must* use this command on a locked buffer, otherwise the command will  fail. See LockBuffer. 

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Also, you must make sure that the coordinates that you are copying from and  to are valid, otherwise you will end up overwriting other areas of memory. 

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WARNING: 

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By not following the a