Thanks Sheco!
Here's what I used:
<html>
<!--Below if statement will hide the first table row if user doesn't use the Application - sessionWPID is blank -->
<% IF Len(Session("sessionWPID")) > 0 THEN %>
<tr align="center">
<td width="100%" height="9" valign="top" align="center">
<FONT FACE="Verdana, Arial, Helvetica">
<b>WP Identifier<br>
<input type="text" readonly="True" name="textboxWPID" size="55" value=<%= session("sessionWPID") %> >
</font></TD>
</tr>
<% END IF %>
</html>