setuid to a non-root uid for both effective&real uid

1. effective UID vs. Real UID with su - problem

Experts,

The situation is :
---------------------------------------------------------------------------
sunfire{/home/dxsnezhk}# id
uid=60144(dxsnezhk) gid=1(other)
sunfire{/home/dxsnezhk}# /usr/xpg4/bin/id -u -nr
dxsnezhk
sunfire{/home/dxsnezhk}# whoami
dxsnezhk
sunfire{/home/dxsnezhk}# who am i
dxsnezhk   pts/1        Mar 31 11:06    (10.4.242.8)
sunfire{/home/dxsnezhk}# su -
Password:
Sun Microsystems Inc.   SunOS 5.8       Generic Patch   October 2001
You have new mail.
sunfire{/}# id
uid=0(root) gid=1(other)
sunfire{/}# /usr/xpg4/bin/id -u -nr
root
sunfire{/}# whoami
root
sunfire{/}# who am i
dxsnezhk   pts/1        Mar 31 11:06    (10.4.242.8)
sunfire{/}# passwd
passwd:  Changing password for dxsnezhk
New password:
sunfire{/}#
---------------------------------------------------------------------------

As you can see, even with su -      my real UID does not change for
some commands? I am coming from HP-UX background and I expect EUID ==
RUID upon
su - . Also, I don't understand why id and who command report
different values. What am I missing ?

Thanks.
Dimitry.

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