HP OpenVMS Guide to System Security: OpenVMS Version 8.4 > Appendix A Assigning Privileges

SHARE Privilege (All)

The SHARE privilege lets processes assign channels to devices allocated to other processes or to a nonshared device using the Assign I/O Channel ($ASSIGN) system service.

Grant this privilege only to system processes such as print symbionts. Otherwise, an irresponsible user can interfere with the operation of devices belonging to other users.