SF_TERMINATE_PROCESS    = -1
SF_CREATE_WINDOW        = 0 
SF_PUT_PIXEL            = 1 
SF_GET_KEY              = 2
SF_GET_SYS_TIME         = 3
SF_DRAW_TEXT            = 4
SF_DEFINE_BUTTON        = 8
SF_WAIT_EVENT           = 10
SF_REDRAW               = 12
    SSF_BEGIN_DRAW  = 1
    SSF_END_DRAW    = 2
SF_GET_BUTTON           = 17
SF_SYSTEM_GET           = 26
    SSF_SYS_LANG    = 5
SF_SET_EVENTS_MASK      = 40
SF_BOARD                = 63
    SSF_DEBUG_WRITE = 1
SF_SYS_MISC             = 68
    SSF_HEAP_INIT   = 11
    SSF_MEM_ALLOC   = 12
    SSF_MEM_FREE    = 13
    SSF_LOAD_DLL    = 19