In The Witcher 2: Assassins of Kings, the primary method of interaction with NPCs is through the use of the mouse. 
is primarily used to select dialogue options and 
is primarily used to skip sections of speeches and cut scenes. Either button can be used to skip individual spoken lines.
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this icon is used to buy and sell items |
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this icon is used to have an item crafted |
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this icon is used to initiate a game of dice poker |
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this icon is used to initiate an arm wrestling match |
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this icon is used to engage in a fistfight |
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this icon is used to bribe an NPC |
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this icon is used to attempt to influence an NPC to do or say something using the Axii sign. Depending on Geralt's level of expertise, this can fail. |
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this icon is used to attempt to persuade an NPC using the Persuasion ability |
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this icon is used to attempt to intimidate an NPC using the Intimidate ability |
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this icon lets Geralt choose a different hairstyle |
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this icon is used access permanent storage, usually from innkeepers |
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this icon is used to end a conversation |