How to run different versions of the same project at the same time?
<p>I have 2 versions of the same project.
I copied version A and pasted it in another directory. Lets call this copied version B.
When I change some code in version A and I want to run version B the compiler see the changes I made in version A.</p>

<p>How can I run this B version without the changes I have made in version A?</p>
