I've found next page in JBoss Community - http://www.jboss.org/community/wiki/ConfigurePorts
There is next text:
Edit server/default/conf/bootstrap/bindings.xml
But I do not see file bindings.xml in JBoss 5.1.0 GA.
Does anyone know - what files should be changed in order to hav ability to start several instances of JBoss 5.1 on the same machine?