By default the LispWorks ORB uses port 3672.
To specify a known other port, pass it via the ORB initarg
on the command line, for example:
my-corba-server -ORBport 12345
To allow the system to choose a port, pass the special value 0:
my-corba-server -ORBport 0
Note: it is possible to run only one ORB instance at a time in LispWorks. So for concurrent LispWorks ORBs, you will need to run multiple images.