The ALLSPOOL privilege lets the user's process
allocate a spooled device by executing the Allocate Device ($ALLOC)
system service or by using the DCL command ALLOCATE.
The $ALLOC system service lets a process allocate
or reserve a device for its exclusive use. A shareable mounted device
cannot be allocated.
Grant this privilege only to users who need to
perform logical or physical I/O operations to a spooled device. Ordinarily,
the privilege of allocating a spooled device is granted only to symbionts.