sean@Sean:~$ ls -L /usr
bin  doc  games  include  info  lib  local  NX  sbin  share  src  X11R6

sean@Sean:~$ ls -L /usr/NX
bin  lib  share
sean@Sean:~$ ls -L /usr/NX/bin
nxclient  nxesd  nxprint  nxssh
sean@Sean:~$