Controls sign on of users to the IBM Session Manager system.
This parameter is applicable to the SYSTEM control statement (see SYSTEM statement).
ALLUSERS=Yes enables all users to sign on to the IBM Session Manager system, irrespective of whether matching USER statements are defined.
External security may be controlled by the Sign-on Validation exit point (E21) of the User exit documented in the Installation and Customization manual.
ALLUSERS=No restricts users signing on to those which have a matching userid defined by a USER statement. This enables the effect of the ALLUSERS parameter to be reversed when using the Update facility.