Here  is a truss trace  of what  vtdaemon  does  when  ALT-L + F2   is pressed.
  each time a key is pressed  a new  Door Return event happens but VTdaemon 
  does not "do"  anything.
 


505:    psargs: /usr/lib/vtdaemon -k -c 16
505/3:          door_return(0x00000000, 0, 0x00000000, 0xFECAFE00, 1007360) (sle
eping...)
505/1:          pollsys(0x08047D90, 1, 0x00000000, 0x00000000) (sleeping...)
505/1:                  fd=4  ev=POLLIN|POLLPRI|POLLRDNORM|POLLRDBAND rev=0
505/4:          door_return(0x00000000, 0, 0x00000000, 0xFEBB0E00, 1007360) (sle
eping...)
505/2:          door_unref()                    (sleeping...)
505/3:          door_return(0x00000000, 0, 0x00000000, 0xFECAFE00, 1007360) = 0
505/3:          door_ucred(0x08064BF0)                          = 0
505/3:                  euid=0 egid=0
505/3:                  ruid=0 rgid=0
505/3:                  pid=0 zoneid=0
505/3:                  E: all
505/3:                  I: basic
505/3:                  P: all
505/3:                  L: all
505/3:          door_return(0x00000000, 0, 0x00000000, 0xFECAFE00, 1007360) = 0
505/3:          door_ucred(0x08064BF0)                          = 0
505/3:                  euid=0 egid=0
505/3:                  ruid=0 rgid=0
505/3:                  pid=0 zoneid=0
505/3:                  E: all
505/3:                  I: basic
505/3:                  P: all
505/3:                  L: all
505/3:          door_return(0x00000000, 0, 0x00000000, 0xFECAFE00, 1007360) = 0
505/3:          door_ucred(0x08064BF0)                          = 0
505/3:                  euid=0 egid=0
505/3:                  ruid=0 rgid=0
505/3:                  pid=0 zoneid=0
505/3:                  E: all
505/3:                  I: basic
505/3:                  P: all
505/3:                  L: all
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