Examples:

A most common form example:
HTML4STRICT Code:

<form action="plug.php" method="get">
<input type="hidden" name="e" value="cse" />
<input type="text" name="q" />
<input type="submit" value="Search" />
</form>


This form will search in pages labeled "Forum" only:
HTML4STRICT Code:

<form action="plug.php" method="get">
<input type="hidden" name="e" value="cse" />
<input type="hidden" name="c" value="forum" />
<input type="text" name="q" />
<input type="submit" value="Search" />
</form>


This is a simple example how to search from address bar:
HTML4STRICT Code:

<a href="plug.php?e=cse&q=my+query">My query</a>
.