[ADSM-L] Simultaneous tape use?

Is it possible for a tape to be used by two users simultaneously?  It
certainly looks like it.
 
The results of 'Q MO':
 
ANR8330I 3592 volume C30274 is mounted R/W in drive DR9995 (/dev/rmt15),
status: IN USE.
ANR8330I 3592 volume C31093 is mounted R/W in drive DR55337
(/dev/rmt11),
status: IN USE.
ANR8330I 3592 volume C30298 is mounted R/W in drive DR0120 (/dev/rmt13),
status: IN USE.
ANR8330I 3592 volume C03230 is mounted R/W in drive DR55304 (/dev/rmt9),
status: IN USE.
ANR8330I 3592 volume C30309 is mounted R/W in drive DR5451 (/dev/rmt0),
status:
IN USE.
 
The results of 'Q PR':
 
 Process Process Description  Status
  Number
-------- --------------------
-------------------------------------------------
      38 Backup Storage Pool  Primary Pool SERVDISKPOOL, Copy Pool
OFFTAPEPOOL,
                               Files Backed Up: 104033, Bytes Backed Up:
                               119,833,665,536, Unreadable Files: 0,
Unreadable
                               Bytes: 0. Current Physical File (bytes):
                               8,043,745,280 Current output volume:
C30274.
      40 Backup Storage Pool  Primary Pool SQLDISKPOOL, Copy Pool
OFFTAPEPOOL,
                               Files Backed Up: 615, Bytes Backed Up:
                               250,397,048,832, Unreadable Files: 0,
Unreadable
                               Bytes: 0. Current Physical File (bytes):
                               3,839,164,416 Current output volume:
C31093.
      42 Migration            Disk Storage Pool SERVDISKPOOL, Moved
Files:
                               9301, Moved Bytes: 197,894,979,584,
Unreadable
                               Files: 0, Unreadable Bytes: 0. Current
Physical
                               File (bytes): 10,488,971,264 Current
output
                               volume: C03230.
      43 Migration            Disk Storage Pool SERVDISKPOOL, Moved
Files:
                               7456, Moved Bytes: 130,884,796,416,
Unreadable
                               Files: 0, Unreadable Bytes: 0. Current
Physical
                               File (bytes): 8,043,745,280 Current
output
                               volume: C30309.
      44 Migration            Disk Storage Pool SERVDISKPOOL, Moved
Files:
                               5441, Moved Bytes: 151,328,727,040,
Unreadable
                               Files: 0, Unreadable Bytes: 0. Current
Physical
                               File (bytes): 144,166,912 Current output
volume:
                               C30298.
 
The above are processes and what follows is a backup session.
 
Client                     Session     Tape Volume
------------------     -----------     -------------
OIA                          11156     C30298
 
The client session is sharing the tape with process 44.  Both are
apparently writing.  I've never seen this before.