kill(2)

[vp@example.com (Viktor Pavlenko)]

Here is an excerpt from HP's kill(2) man page (the one on linux
is too sparse):

   The real or effective user ID of the sending process must match the
   real or saved user ID of the receiving process unless the effective
   user ID of the sending process is a user who has appropriate
   privileges.

Can anybody tell me what's exactly `appropriate privileges'?

Thanks
Viktor