Multiple postgresql serices on same windows machine..

Can I install multiple postgresql 8.2.4 services on same Windows 2003
Server ?

My scenario

Application A which is already existing in the system
is using postgres database ( It used port 5432 and Windows account
postgres is used as the service account )

Application B too uses postgresql database.( It uses a
windows account say "ServiceAccount" for starting postgresql service and
uses another port say 54321)

The service account postgres's password is not known to
application B and service account ServiceAccount's password is not
known to application B.

How can we install both application on same machine?

AnooP
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