An office system comprising a portable computer (1) comprising a processing unit (2) able to run at least one preferred application (T), an integrated output means (3) and an integrated input means (4), said office system further comprising an additional output means (5) which can be selectively connected to said portable computer (1) and at least one additional input means (6) which can be selectively connected to said portable computer (1), where either said integrated output means (3) and input means (4), or said additional output means (5) and input means (6), are reserved for the preferred application (T) when said additional output means (5) and input means (6) are connected to said portable computer (1).
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