A man goes into a pet shop to buy a monkey

A man goes into a pet shop to buy a monkey.

The shop owner points to 3 identical looking monkeys on a perch and says the monkey on the left cost $ 500.00

Why does that one cost so much? asked the shopper.

The owner says well the monkey knows how to use a computer.

The man then asks about the next monkey and was told that this one cost $1000.00,…

because it can do everything the other monkey can do plus he knows the Unix operating system.

Naturally the increasingly startled man asks about the third monkey to be told that it costs $ 2000.00

Needles to say this begs the question.

What can it do?

To which the owner replies:

“To be honest I have never seen him do a thing but the other two call him BOSS