>>> 	- Solaris uses struct utmpx, instead of utmp.  which does not look very
>>> 	  good to me.
>>The reason that Solaris and other (almost all) commercial UNIX keep
>>old utmp format (and use other file like utmpx for extended
>>information) is binary compatibility for third party applications.
>	Solaris utmpx does not look binary compatible to utmp at all.  I don't
>	understand what you mean here.

	forget it.  you said "binary compatibility" to mean "utmp and utmpx
	are separate files and older program using /var/log/utmp works okay".

itojun