DuplexMode - I need explanation

The PrintOptions.Duplex property is of type TfrxDuplexMode and can have one of the following values:
- dmNone
- dmVertical
- dmHorizontal
- dmSimplex

I can't find a description of these values. So...
- What does dmNone actually mean?
- What is the difference between dmNone and dmSimplex modes?
- If the printer is configured to duplex by default, but I want to print on one side, I have to set dmSimplex value. What if I set a value other than dmNone, but the printer cannot print both sides? Wouldn't it cause any problem?

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