How to re-open Mac book when you forget password

But this is very simple when you want to recover your MacBook without using the CD . The following steps solve the problem:
(1) Switch off your MacBook for like 2-4 seconds
(2) Then switch on and hold on the the Alt or Option key
(3) Depending on how you use you MacBook *& then pree the enter or return key....
(4) Its done and you re-type your password. thats it.........!!!

http://support.apple.com/kb/ht1212
Basic troubleshooting steps  
17" 2.2GHz i7 Quad-Core MacBook Pro  8G RAM  750G HD + OCZ Vertex 3 SSD Boot HD 
Got problems with your Apple iDevice-like iPhone, iPad or iPod touch? Try Troubleshooting 101
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