dont think thats very usefull

Code:
ttd$oracle7@E73GC04>!uname -a
SunOS SSESMADT001 5.6 Generic_105181-26 sun4u sparc SUNW,Ultra-Enterprise

ttd$oracle7@E73GC04>select dbms_utility.port_string OS from dual;

OS
------------------------------
SVR4-be-7.0.0
doesnt say Solaris 5.6 anywhere