Hi Ramatajama,
Most likely you are just missing one simple step, which is to turn on the Citadel service that allows any client, such as DIAdem, to get to the data in the Citadel database.
You do not have to have the Citadel database on the same computer that DIAdem resides on, but you DO have to go to "NI Service Manager" on the DIAdem computer and "start all services". Usually the NI Service Manager icon shows up in your system tray at the far bottom right of your computer screen.
Ask again if this isn't enough info,
Brad Turpin
