How to connect second instance if server has two instance?

We have one sql server 2005 machine which have two instance named:
DEVSQL(default server named when first installed) and DEVSQL\TESTING (second
installed). On the client, I can connect default instance, but the second
instance cannot connect. What settings I should to do?
Hi,
you will have to provide either the instancename or the portnumber in
the conenctionstring or you connection dialog of choice:
Servername\InstanceName (If SQL Browser is activated it will redirect
the request to the appropiate listerner of the instance
or
Servername,portnumber
HTH, Jens K. Suessmeyer.
http://www.sqlserver2005.de