Borderlands – What does the ‘Secondary Use’ key do

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I'm rebinding melee and skill power activation to keys closer to the WASD keys to make them more accessible. I was going to rebind Q, but by default it is set to "Secondary Use".

The only use of that key in-game that I've noticed so far is that it allows you to shop with NPCs instead of just talking to them. Are there any other uses for this key?

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Best Answer

Secondary use button is used when you can chose between multiple interactions with an NPC;like with Marcus and Dr.Zed where you can either use "E" to simply talk to them or use "Q" to enter their shop interface.

Another example is when you finish a certain quest for Claptrap and you can press "Q" to ask him for a high-five.

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