How to set up a PPTP VPN connection

How to set up a PPTP connection to a VPN server, it is normally built into your Computer, iPhone, or android

Tutorials to set up a PPTP;

• Windows 7 http://alewisgb.blogspot.com/2012/09/set-up-pptp-for-windows-7.html
• Windows XP http://alewisgb.blogspot.com/2012/09/set-up-pptp-for-windows-xp.html
• Mac http://alewisgb.blogspot.com/2012/09/set-up-pptp-on-mac.html
• iOS e.g iPhone, iPad http://alewisgb.blogspot.com/2012/09/set-up-pptp-on-iphone.html
• Android http://alewisgb.blogspot.com/2012/09/set-up-pptp-on-android.html
• Linux http://alewisgb.blogspot.com/2012/09/set-up-pptp-on-linux.html