how to zimbra work with register and login

[antelopeming]

hello , everyone , this is a new man just working for zimbra , now my company want me to make a new website page just for deal with register and login , and i looked the programmer , but i dont's know how it's work ?
just like :
zimbra\zcs-src\ZimbraWebClient\WebRoot\public\login.jsp
this is a login page ,
and i found the code :
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<c:url var="formActionUrl" value="/">
<c:forEach var="p" items="${paramValues}">
<c:forEach var='value' items='${p.value}'>
<c:if test="${not fn:contains(ignoredQueryParams, p.key)}">
<caram name="${p.key}" value='${value}'/>
</c:if>
</c:forEach>
</c:forEach>
</c:url>

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<form method='post' name="loginForm" action="${formActionUrl}">

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so tell me .which postion the action will turn to ?
thanks