Two ways, assuming A and B are the same platform (OS)

If you have no access to A then pretend to be A by editing the opt file to
change the node name to A then the ADSM server
will believe you to be A and with the pass word for A can do the restore. This
is NOT the prefered method and can be a problem
if you do not reset the opt file or if you do a backup while loged on as the
wrong node.

The PREFERED method is to SET ACCESS on A for B to all of its backups. Then use
-fromnode in you RESTORE or Q BACKUP
command and you can veiw and restore As stuff to B.
command and you can veiw and restore As stuff to B.

 Regards
  Daniel