Sensoray 2250 Linux Ver2.0.X - Manual (Page 11)

int SN_SetBrightness(
int boardnum,
int brightness
);
Sets the brightness(0-100)
Parameters
boardnum
board instance in system.
brightness
Video brightness 0-100( 50 is default).
Returns
0 on success, negative value if error(see s2250mid.h)
int SN_SetCaption(
int boardnum,
int xstart,
int ystart,
char *text
);
Not supported in V2.0.0 release.
Sets the text caption.
Parameters
boardnum
board instance in system
xstart
x position in pixels. Position is rounded to the nearest 16x16 pixel block.
Ystart
y position in pixels. Position is rounded to the nearest 16x16 pixel block.
text
text to display (a maximum of 96 characters total for all overlay windows).
Returns
1