Is it possible on Macs using helvetica as a typeface?

[MacRumors' FAN]

Hi,
Title of my thread is easy to understand: could anyone tell me how change typeface (I love helvetica) and use only that everywhere on Mac?
Best regards.

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https://www.google.it/search?q=helv...l-wallpapers-for-helvetica-lovers%2F;1440;900

 

[McGiord]

http://www.youtube.com/watch?v=EkQ7cmovxPU

 

[MacRumors' FAN]

Thanxs. Is there on MacRumors a guide?

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I trust much more on MacRumors' guides, but if that video is the best guide on Internet for me it's enough. Guides on MacRumors are the best guides I have ever seen on Internet.

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Just look here: http://guides.macrumors.com/, but there are not guides about typefaces changing. Or am I wrong? Let me know below.

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Mine is a MacBook Pro (Retina, 15-inch, Late 2013) updated at OS X Mavericks.