IDL2Pas can be launched from a wizard that is integrated into the Delphi IDE. Select File | New | Other to bring up the "New Items" tabbed dialog box.

There is a new tab for Corba objects. Select either the Corba Server or Corba Client to generate a new project. The Corba wizard allows you to choose between a DOS console application or a Windows application. You add existing IDL files to the list shown in the dialog box.

The "Options" tab lets you set specific options for you project. For example, if you're generating a Corba server, you can choose whether your implementation file(s) generated by IDL2Pas are over written each time.

If you have an existing project and change your IDL file, you can regenerate the Corba files by choosing Tools | Regenerate Corba IDL Files... from the main Delphi menu. This will over write your existing files.