This structure describes the 'GEM memory usage parameter block', which is defined as follows:
typdef struct
{
int32_t gm_magic; /* Magical value, has to be 0x87654321 */
void *gm_end; /* End of the memory required by GEM */
void *gm_init; /* Start address of GEM */
} GEM_MUPB;
See also: _sysbase OSHEADER System variables System vectors