Multiple Database query in Interbase

I have a database (interbase) that stores all common data (eg employee).

In another database the data for helpdesk calls are stored. In the tables only
the reference number of the employees are stored (third normalization grade)

How can I write a query that gets the helpdesk calls with the full username. I
first made the application in MS SQL and there it was easy:

Select CalNr,CalDesc,EmpName from call,util.dbo.employee dbEmployee
  Call.EmpCode = dbEmployee.Empcode

How to do this in Interbase?

Please post some ideas.

Robert van Hoornaar
Software Engineer KTI BV

May the Source be With You