Re: How many people can have account access
I dont think there is a limit on how many people can access the account because typiclly i dont think you need like lets say over 100 people accessing an Adwords account but you can limit the kind of access you want certain individuals to have.
For example there is Admin vs. Read-Only Access. Admin can change practically anything in the account while people with Read-Only cant change anything but they are able to read ceratin information in the account you would like. For more detailed information check out this link: http://support.google.com/adwords/answer/1704346?hl=en
It will give you all the information you need.