DEF CLEARHANDLE Statement 
DEF CLEARHANDLE 
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handle& is a valid handle to a relocatable memory block, this statement sets all of the bytes in the block to zero. If
handle& is not a valid handle, the statement does nothing.
See Also 
DEF DISPOSEH; Inside Macintosh: http://developer.apple.com/documentation/macos8/mac8.html, Memory: http://developer.apple.com/documentation/mac/Memory/Memory-2.html