To activate all the cheats in the PC version of Theme Hospital, when you get a fax, type out "24328" by clicking on the number buttons on the keypad, then clicking the large green button.
Back on the main game screen, press the following keys for the relevant effect:
|+||Increase bank balance|
|+ +||Unlock all rooms and equipment|
|+||Skip to the end of the current month|
|+||Skip to the end of the current year|
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