High Biological protein

[food_techie]

What is the difference between high biological protein and low biological protein? (In reference to diets, food consumption) I was asked this question and I could only think of the Atkins Diet - thinking of reports on high protein diets potential harm over long-term.
Which of these protein sources is the better in relation to a diet? What foods are from each? Is low biological protein from vegetables and high biological protein from meat, eggs etc?

[Sequin]

In this instance High protein means the amount in relation to other items in the diet, such as fats and carbohydrates - nothing to do with the proteins themselves.

A diet that is 70% protein, 30% others is a high protein diet, while 70% others, 30% protein would be a low protein diet

[artee]

http://www.google.com/search?sourceid=navclient&ie=UTF-8&rls=GGLD,GGLD:2004-35,GGLD:en&q=high+biological+protein
It appears, according to some of the info on these sights, that the high bio prot diet is one that has all of the essential amino acids incorporated in the diet. It does't mean  that it is made up of only animal protein, but can be made up in a vegetarian diet by eating the various foods containing these essential am acids, but not necessarily in the same food or even at the same meal. You may be able to decipher more by going to the page, by clicking on the above address.