The jsp page has several impleciate objects. These are objects available to your page with you having to create it.
page - ServletContext
out - JspWriter
session - ServletSession
etc.
From the Tag class and all subclasses, you have an Object pageContext. It has methods to allow you to access any of the implecitate objects on your JSP page. eg
ServletSession session = pageContext.getSession();
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I Hope This Helps
Carl Trusiak, SCJP2, SCWCD