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VS 2010 Entity Framework and relationships in Vb

I have recently being following the various tutorials on creating models in the entity framework and reading them with vb code.

I have managed to create a model and add the relationships between the tables in the model.

These can be one to one, one to many etc.

What I can't understand is when the relationship is set between the tables, what are keys used to link the two tables.

The properties for the link simply shows the other table and not the two fields.

Whilst I many not be understanding it correctly, I am expecting the value in one table to be looked up (as the key) in the next table ?

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