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  Function 26H is used within a program to prepare for loading and executing
  another subprogram, or overlay. When you call function 26H, DX must
  contain the paragraph address of the start of the memory area where you
  want DOS to build the new PSP. DOS builds a new PSP at the location you
  specify. You can then load an executable program from a file into the
  memory above the new PSP and transfer control to it.

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  NOTE:
    Function 26H is obsolete. You should use function 4BH (Chapter 17) to
    load and execute a new program from within another executing program.
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