Hello,

m> I want to have both Firebird 1.5.2 and Firebird 2.0 beta running on
m> the same machine. What modification of the configuration files do I
m> have to do to have them both running with their own databases?

- don't register Fb2 as a service - run it as an application.
- change the RemoteServicePort in Fb2's config file, and set
CreateInternalWindow to 0 in both config files (Fb1.5 and Fb2). AFAIU
Fb2 is not supposed to use this last one, but just in case...
- run Fb2 manually using this command file:

set FIREBIRD=<path>
<path>\bin\fbserver.exe -a

where <path> is the path in which you have installed Fb2.
You could run it on startup/login if you wish.

HTH
--
Nando Dessena
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