Implemented actions widget and editing functionalities

help/files/401_01_program.html

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+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
+
+<html>
+<head>
+<title>A Program</title>
+<link href="style.css" rel="stylesheet" type="text/css">
+</head>
+<body background="images/back.gif">
+<!--START-->
+
+<h3>A program</h3>
+
+A program consists of a set of instructions, called statements.  A program
+must start with the symbol '{' and end with the symbol '}'. Between these
+symbols there are the statements. Statements must be separated with a ';'
+symbol. So the global structure of every program is:
+
+<p>
+<blockquote>
+<pre>
+{
+  &lt;statement&gt;;
+  &lt;statement&gt;;
+  ...
+}
+</pre>
+</blockquote>
+
+<p>
+There are a number of different types of statements, which will be
+discussed below.
+
+<!--END-->
+</body>
+</html>
+
+<!-- KEYWORDS
+program
+statements
+statement separator
+-->