Solaris 9 Reference Manual Collection (http://docs.sun.com/db/coll/40.7)
IBM AIX 5.2 documentation (http://www16.boulder.ibm.com/pseries/en_US/infocenter/base/aix52.htm)
HP-UX 11i Version 2 (http://docs.hp.com/hpux/onlinedocs/B2355-60103/B2355-60103.html)