>> 	- 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.

itojun