vxworks 6.x:

(one login session, say over serial)

  -> ioTaskStdGet 0, 1
  value = 3 = 0x3
  -> taskIdSelf
  value = 13600784 = 0xcf8810

(another session, say over telnet)

  -> ioTaskStdSet 0xcf8810, 1, 0x9
  value = 0 = 0x0

(first session ie SERIAL)

  -> printf "foo\n"
  -> taskIdSelf
  -> i

(otherone eg TELNET)

  -> foo
  value = 4 = 0x4
  value = 13600784 = 0xcf8810


     NAME         ENTRY       TID    PRI   STATUS      PC       SP     ERRNO  DELAY
  ----------  ------------ -------- --- ---------- -------- -------- ------- -----
  ...

teeheeheehaw!