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Brightness & Binding touchpad taps

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linux-howto

http://crunchbang.org – Hello everyone,I would like to bind ' two taps' on my touchpad to middle click and 'three taps' on my touchpad to right click. How can I do that?And also how can I change the screen brightness? (Increase/decrease key don't work.)And my laptop has an Nvidia gfx card, how to get it working with optimus technology? (So, that CPU switches between on board graphic card and dedicated gfx card according to needs. Something related to bumblebee, I haven't installed the drivers as of now lest I mess something.)Thanks in advance! (HowTos)