Marks an existing permanent global section for deletion. The
    actual deletion of the global section takes place when all
    processes that have mapped the global section have deleted the
    mapped pages.

    On Alpha and Integrity server systems, this service accepts 64-
    bit addresses.

    Format

      SYS$DGBLSC  [flags] ,gsdnam ,[ident]

    C Prototype

      int sys$dgblsc  (unsigned int flags, void *gsdnam, struct

                      _secid *ident);