Including objects from third-party DLL's in VB?

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So I'm at work and I've been given a project. I need to detect alerts from another software package, and deliver them to my companies software as an event.

I've got the delivery down. That was the easy part. Now I need to detect the alerts. I'm programming in VB, in Visual Studio 2005. I need to be able to declare an object defined in one of the external DLL's.

I'm a total noob in Visual Studio... I've never done any .NET programming, and the last time I touched visual basic was 4 years ago, with Visual Basic 5/6