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"Still sitting on the task to describe a Pile_Object, I will have another look at what the "Pile for Beginners" a.k.a. the 'no magic' document of Erez and Miriam at piletech.org calls the patent pending technique, which Pile is using for conversion between the logical and the physical (HD, RAM) address space: the Combinative Pointer." post 
[…] principle questions concerning the concept of the Combinative Pointer, in which context Erez introduces the "diagonal" representation. (Pile-Programming Workshop, Juli, 22nd - 24th 2005, workshop_22-24_07_05.txt)
Pile_Demo.exe as of 2005-10-30