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MS OS/2 version 1.2 changes
 
Typically, DosReallocHuge can increase, not decrease, the size of shared
huge segments. If the shared segment is allocated by the DosAllocHuge
function, the segment can be decreased in size by setting the fsAttr
parameter to SEG_SIZEABLE.
 
DosReallocHuge can be issued from ring 2, but only ring-3 segments are
affected by this function.
 
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