[Samba] how to set valid allowed workstation logins

[Chris]

I'm having trouble setting the Workstations value on a tdbsam backend 
using pdbedit. I can't seem to find the correct syntax to accomplish 
this.

I found some references in an older version of the HOWTO where there 
existed "Chapter 10. Account Information Databases". This whole chapter 
is missing from the current HOWTO even though it is referenced in the 
newest version (a link in chapter 33 under "Passdb Backends and 
Authentication"). In fact, it seems that there is very little 
information on pdbedit and these backends in the version I'm now 
viewing.
Also, virtually every link in the HOWTO points to the TOC instead of 
directly to the section in question. Is this by design?

In the version where there exists an "Account Information Databases" 
chapter there is this example:
===========================================
The following is an example of the user account information that is 
stored in a tdbsam password backend. This listing was produced by 
running: 
$ pdbedit -Lv met
UNIX username:        met
NT username:
Account Flags:        [UX         ]
User SID:             S-1-5-21-1449123459-1407424037-3116680435-2004
Primary Group SID:    S-1-5-21-1449123459-1407424037-3116680435-1201
Full Name:            Melissa E Terpstra
Home Directory:       \\frodo\met\Win9Profile
HomeDir Drive:        H:
Logon Script:         scripts\logon.bat
Profile Path:         \\frodo\Profiles\met
Domain:               MIDEARTH
Account desc:
Workstations:         melbelle
Munged dial:
Logon time:           0
Logoff time:          Mon, 18 Jan 2038 20:14:07 GMT
Kickoff time:         Mon, 18 Jan 2038 20:14:07 GMT
Password last set:    Sat, 14 Dec 2002 14:37:03 GMT
Password can change:  Sat, 14 Dec 2002 14:37:03 GMT
Password must change: Mon, 18 Jan 2038 20:14:07 GMT
===========================================

Which clearly shows a non-null "Workstations" value in a tdbsam backend. 
But there is no specific pdbedit syntax provided for changing it, nor 
does the man page make it clear.

Assistance appreciated.

Chris