...1LOGIN]000READ.ME
--------------------
This .COM file may be used to prevent a user from logging in more than
once on a VAXCluster.

This is another 'stupid DCL trick'!

The trick is:
	$ open/read/write/error=denied _1login 'fna'
Note that the 'handle' used for the file starts with '_'.  Because of
how logical name translation works, once the file is open, the user
*CANNOT* close the file.  The close command sees the '_' and fails to
locate the DCL logical used to point to the 'real' file.  The same thing
happens if the user tries to write to the file.

This 'feature' may go away in subsequent versions of VMS.

Use the LOCKUSER file to establish/delete locks for users.  If the lock
exists, you will be asked if you want to delete it.  If not, it will create it.
The 1login stuff uses SYS$COMMON:[1LOGIN]*.lck to coordinate access.

Use SYS$MANAGER:SYLOGIN.COM to call 1LOGIN.COM for each interactive login.

--------

This directory is the dumping ground for several other idiot DCL procedures
that might be of interest.