Question : Start multiple Enterprise Manager Components

I've installed application server infrastructure (10g version 2) and Business Intelligence on a single machine.
Infrastructure was assigned a port 1810 and Business Intelligence 1811.   When I go to start them up using
emctl start iasconsole, the first, port 1810 comes up , but I don't see how to specify i want the port 1811 on the next time i enter a emctl start iasconsole.  When I issue the second time, the message says 1810 is already running.   How to I start the EM on port 1811??
oracle@egus bin]$ emctl start iasconsole
TZ set to US/Eastern
Oracle Enterprise Manager 10g Application Server Control Release 10.1.2.0.0
Copyright (c) 1996, 2004 Oracle Corporation.  All rights reserved.
http://134.154.231.237:1810/emd/console/aboutApplication
- An instance of Oracle Enterprise Manager 10g Application Server Control is already running.

Answer : Start multiple Enterprise Manager Components

One instance of OEM can use only one port.
If you need another OEM using another port you have to do this in another Oracle Home, because the port and other details are set in the sysman configuration files. I hope OAS 10g has it own OEM and you try to reestablish it.