[Samba] Multiple Users On One Share With Permissions=755 for Created Files

[dpgirago at mdanderson.org]

Howdy Samba Group,

I'm about 2 clicks away from being a total Samba newbie, but I did manage 
to get one up and running on RH9 in a W2K / Novell for Windows 
environment.
The shares are set up like this:

--  each member of the group has a private share accessible only from 
their desktops
--  a common share, 'research ', accessible to any member of the research 
group from any of the computers belonging to any of these members
--  a guest share accessible from anywhere in our subnet  ( by anyone who 
knows the username and password, of course ).

And now I've been asked to set up  --  or alter the config file for  --  a 
share for members of the research group whereby each member can create 
files with RWX for themselves but others can only R - X . This is to allow 
joint code development in the group. But not only do I not know how to do 
this, I'm not sure it can even be done. Don't you access a share by 
supplying a username and password, and wouldn't that then identify each 
connection as that particular user? If so, then all files created would 
essentially have been done so by the same user, no?

If anyone can confirm or contradict my thinking, or point me in the right 
direction conceptually, I'd be much obliged.

TIA,
 
dave