Yes, actually there are quite a few ways to authenticate to an Apache server/site.
On this url: http://freeradius.org/mod_auth_radius/ you will find a good explanation of how to set up an Apache website to use something called Radius authentication. There is also Basic (which was already mentioned) along with a few other methods which are typically implemented the same way.
What will happen when you set up this type of authentication is when the user goes to the website, a dialog box will pop up asking for user id and password. Once that is entered the user will have access to that site from then until they close their browser...
Are you posting in the right place? Check out Where do I post X? to know for sure.
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
Want more info? How to link or
or How to display code and escape characters
are good places to start.