How to find constant, SPI_GETSCREENSAVERRUNNING?

These are the only SPI Constants that Exist:

#define SPI_GETBEEP                    1
#define SPI_SETBEEP                    2
#define SPI_GETMOUSE                    3
#define SPI_SETMOUSE                    4
#define SPI_GETBORDER                    5
#define SPI_SETBORDER                    6
#define SPI_GETKEYBOARDSPEED             10
#define SPI_SETKEYBOARDSPEED             11
#define SPI_LANGDRIVER                   12
#define SPI_ICONHORIZONTALSPACING   13
#define SPI_GETSCREENSAVETIMEOUT   14
#define SPI_SETSCREENSAVETIMEOUT   15
#define SPI_GETSCREENSAVEACTIVE      16
#define SPI_SETSCREENSAVEACTIVE       17
#define SPI_GETGRIDGRANULARITY             18
#define SPI_SETGRIDGRANULARITY             19
#define SPI_SETDESKWALLPAPER             20
#define SPI_SETDESKPATTERN             21
#define SPI_GETKEYBOARDDELAY             22
#define SPI_SETKEYBOARDDELAY             23
#define SPI_ICONVERTICALSPACING        24
#define SPI_GETICONTITLEWRAP            25
#define SPI_SETICONTITLEWRAP            26
#define SPI_GETMENUDROPALIGNMENT 27
#define SPI_SETMENUDROPALIGNMENT    28
#define SPI_SETDOUBLECLKWIDTH          29
#define SPI_SETDOUBLECLKHEIGHT          30
#define SPI_GETICONTITLELOGFONT     31
#define SPI_SETDOUBLECLICKTIME          32
#define SPI_SETMOUSEBUTTONSWAP          33
#define SPI_SETICONTITLELOGFONT     34
#define SPI_GETFASTTASKSWITCH       35
#define SPI_SETFASTTASKSWITCH       36

This is a new one.

I already got SPI_SCREENSAVERRUNNING it is used to tell the system that a saver is running, SPI_GETSCREENSAVERRUNNING is to find out whether a saver is running.