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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documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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MS OS/2 version 1.2 changes
 
If DosReallocSeg is used to reallocate a shared segment to a size smaller
than its original size, the segment must have been created using the
DosAllocSeg function with the SEG_SIZEABLE attribute set. This request can
be issued from ring 2 or ring 3; the segment to be reallocated can be either
a ring-2 or a ring-3 segment.
 
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