typedef enum { ... } SilcCommandFlags;

    Command flags that set how the commands behave on different
    situations. These can be OR'es together to set multiple flags.
    The application is resoponsible of implementing the behaviour
    of these flags. These are here just to define generic flags.
    The server usually makes use of these flags.

    typedef enum {
      SILC_CF_NONE           = 0,
    
      /* Command may only be used once per (about) 2 seconds. Bursts up
         to 5 commands are allowed though. */
      SILC_CF_LAG            = (1L << 1),
    
      /* Command may only be used once per (about) 2 seconds. No bursts
         are allowed at all. */
      SILC_CF_LAG_STRICT     = (1L << 2),
    
      /* Command is available for registered connections (connections
         whose ID has been created. */
      SILC_CF_REG            = (1L << 3),
    
      /* Command is available only for server operators */
      SILC_CF_OPER           = (1L << 4),
    
      /* Command is available only for SILC (router) operators. If this
         is set SILC_CF_OPER is not necessary to be set. */
      SILC_CF_SILC_OPER      = (1L << 5),
    
    } SilcCommandFlag;