[Zope] Query on WebDAV Lock Manager.

Hi, While editing contents under zope, will it be locked by the WebDAV Lock Manager automatically or does it require some coding to implement the same? I created a sample DTML document and tried to edit it accessing through two browsers and was able to succeed. How can I block one user from editing the content when it is being edited by someone else? Please help if you have some idea on how to go about. Regards, Paul.