and one item on the BOOLEAN stack</p>
<h2><a href="#exec-while" id="exec-while"></a>:exec_while</h2>
<p>Keeps executing the top instruction on the EXEC stack while the top item on the BOOLEAN stack is true</p>
<h2><a href="#exec-do-while" id="exec-do-while"></a>:exec_do_while</h2>
<p>Keeps executing the top instruction on the EXEC stack while the top item on the BOOLEAN stack is true. Differs from :exec_while in that it executes the top instruction at least once</p>
<h2><a href="#exec-k" id="exec-k"></a>:ex