  Network Authentication? User Access Restrictions? 
 The Question is:
 
So far,I have run VT terminals for end-user's Alpha access.
Now,I have got tens of user accounts using telnet terminal access through thin
 client or reflection.
Mostly for displaying FMS screens.
I want to run monitoring process and restrict some access by checking their
 user name.
What SYS$ or RTL$ routines are available for this? Can I have a sample in
 FORTRAN code using this ?
 
 
 The Answer is :
 
  Your question is somewhat unclear, as normal OpenVMS authentication
  provides for typical user authentication requirements.  Details on
  the particular authentication requirements would be useful, as well
  as the associated background.  (The OpenVMS Wizard will here attempt
  to guess your requirements, and the following may or may not match
  your intended goals.)
 
  If you require information on a particular session, the typical
  programming interfaces are sys$getdvi and f$getdvi, and one of the
  more common itemcodes used in this context is DVI$_ACCPORNAM.  There
  are others, and a review of the lexical documentation in the User's
  Guide and the Programming Concepts documentation is in order.
 
  TCP/IP does not offer a reliable means of determining the remote
  user; that information is simply not available within the IP stack
  (in contrast, DECnet provides it) and must be provided by the
  application layer protocol or directly by application code.
  Information on the remote system is available via the SYS$REM*
  logical names and via the response to the DVI$_ACCPORNAM itemcode.
 
  Customizations to login processing are available via $acm (on
  current OpenVMS releases; your V7.2-1 is too old) and via the LGI
  callouts on current and on recent OpenVMS releases.  Customizations
  are also commonly seen made within SYLOGIN.COM, as well, using
  standard DCL lexical functions.
 
  Also available on current OpenVMS releases are Kerberos and LDAP
  authentication interfaces.
 
 Answer written or last revised on  29-SEP-2004 
