The following figure shows how to set the marker foreground color to green.
#define INCL_GPIPRIMITIVES #include <os2.h> void fncMARK04(void){ HPS hps; MARKERBUNDLE mbnd; mbnd.lColor = CLR_GREEN; GpiSetAttrs(hps, PRIM_MARKER, MBB_COLOR, 0L, &mbnd); } /* fncMARK04 */