OpenVMS provides SYS$MANAGER:ICC$SYSTARTUP.COM. This command
procedure allows you to customize the ICC characteristics by creating
ICC security objects and adding additional registry tables.
The ICC$CREATE_SECURITY_OBJECT procedure creates permanent
ICC security objects and optionally issues an initial SET SECURITY
command for the object. Specify node::association to
create a security object for an association before it exists. For
example, specify MYNODE::BOB_SERVER. Use the special node name ICC$
to create a security object for an entry in the ICC clusterwide
registry.
Before creating an association through ICC, you need the OPEN
security attribute on the node::association pair.
A security object created by ICC$CREATE_SECURITY_OBJECT is not deleted
until the system reboots.
The ability to connect to an association is controlled by
the ACCESS security attribute on the security object.
Every process using ICC must open an association. If you have
SYSNAM privilege, you can open associations without calling ICC$CREATE_SECURITY_OBJECT,
however the object is not permanent. No privileges are required,
therefore anyone can create access named ICC$pid*
(for example, ICC$20203F9A_FOO).
ICC$CREATE_SECURITY_OBJECT can also be used to regulate creating
names in the ICC clusterwide registry using the special node name
ICC$. For creating names in the registry, the security access attributes OPEN
and CONTROL are relevant.
Note that SYS$MANAGER: also contains file SYS$SYSTARTUP.TEMPLATE
so that you can customize the procedure to your specific requirements.
HP OpenVMS System Manager's Manual, Volume 1:... 
Security Considerations
