#define C_SCRLAY 0
#define C_PRNLAY 1

#define O_SL_BEGIN_READ 7
#define O_SL_DISCARD_LAYOUT 12
#define O_SL_FORMAT_LINE 9
#define O_SL_INIT 1
#define O_SL_LINE_ENDS 4
#define O_SL_PARA_CHANGED 14
#define O_SL_POS_TO_XL 5
#define O_SL_PRINT_POS 17
#define O_SL_PRINT_READ 16
#define O_SL_READ 8
#define O_SL_RESCALE 15
#define O_SL_SCROLL 10
#define O_SL_SENSE 3
#define O_SL_SET 2
#define O_SL_SET_LINES 13
#define O_SL_VIEW 11
#define O_SL_XL_TO_POS 6