Obtains information about a range of addresses within the virtual-address space of the calling process.

#define INCL_DOSMEMMGR
#include <os2.h>

PVOID     pb;     /*  The base address of the range of addresses to be queried. */
PULONG    pcb;    /*  A pointer to a ULONG containing the size of the range of addresses. */
PULONG    pFlag;  /*  A pointer to a ULONG containing a set of attribute flags describing the type of allocation and access protection for the specified range of addresses. */
APIRET    ulrc;   /*  Return Code. */

ulrc = DosTestAddr(pb, pcb, pFlag);