DosAllocHuge

#define INCL_DOSMEMMGR

USHORT  rc = DosAllocHuge(NumSeg, Size, Selector, MaxNumSeg, AllocFlags);

USHORT           NumSeg;        /* Number of 65536-byte segments */
USHORT           Size;          /* Number of bytes in last segment */
PSEL             Selector;      /* The first Selector
                                    allocated (returned) */
USHORT           MaxNumSeg;     /* Max number of 65536-byte segments */
USHORT           AllocFlags;    /* Allocation flags */

USHORT           rc;            /* return code */

Example 

This example requests a block of memory with 4 segments, the last segment 
having 1,040 bytes.  The block of memory will never be larger than 8 
segments.  The memory can be shared with DosGiveSeg API calls.  The system 
can discard the memory if it needs too. 

#define INCL_DOSMEMMGR

#define NUMBER_OF_SEGMENTS 4
#define BYTES_IN_LAST_SEGMENT 1040
#define MAXIMUM_SEG_SIZE 8
#define ALLOC_FLAG SEG_GIVEABLE | SEG_DISCARDABLE

SEL    Selector;
USHORT rc;

   rc = DosAllocHuge(NUMBER_OF_SEGMENTS,     /* # of 65536-byte
                                                      segments */
                     BYTES_IN_LAST_SEGMENT,  /* # of bytes in last
                                                         segment */
                     &Selector,              /* The 1st selector
                                                     allocated */
                     MAXIMUM_SEG_SIZE,       /* Max number of
                                                       segments */
                     ALLOC_FLAG);            /* Allocation flags */