Difference between <jsp:useBean> and <bean:define> ?

When I define something like the following in my ActionClass (in a Struts/JS
P Architecture)

request.setAttribute("myVo", myVoObject);

I could access this object from my JSP page (as far as I know) by declaring 
a bean like:

<jsp:useBean id="myVo" class="mypackage.myVo" />

resp.

<bean:define id="myid" name="myVo" property="getVo" type="mypackage.myVo" />



But what is the difference?

Is the next html:text tag valid for both declarations?

<html:text name="myidValue" property="myValue" size="10" value="<%= myVo.get
MyValue() %>" />

Anan