Two forms on one admin page [closed]

Question

Noob questions. I have two forms on one page. How do I distinguish them in php code? For example:

    <form action="" method="post">
          <input type="text" name="test1" />
          <input type="submit" value="Add" />
    </form>
    <form action="" method="post">
          <input type="text" name="test2" />
          <input type="submit" value="Add" />
    </form>
    <?php if($_POST) {
          //Do something
    }