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The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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     After the executing program's PSP is copied into the new segment,
     the memory size information in the new PSP is updated
     appropriately and the current contents of the termination (Int
     22h), CTRL+C handler (Int 23h), and critical-error handler (Int
     24h) vectors are saved starting at offset 0Ah.
 
     This function copies the PSP. It does not load or execute another
     program.
 
     Int 21h Function 4Bh (EXEC), which can be used to load and execute
     programs or overlays in either .COM or .EXE format, should be used
     instead of this function.
                                    -♦-