d  item. This file handle allocates the memory to hold the item.

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You will find file handles used all over Blitz. See the example for some well-documented  code.

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Note that when you change the graphics mode using the Graphics command, all images that were loaded will be lost, and all handles will become invalid.  However, with BlitzPlus, the images will sometimes be retained.  Expect more control over this in the next BlitzPlus update.
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See also: <a class=small href=Lo