[Zope] how to authenticate into zope as external user

hiii, I am using zope-2.8.1 version and i wish to login into zope without facing the login window that zope provides i want to make one DTML page which will be used as login page for ZOPE and when I will enter username and password in DTML page, this information should be used for zope authentication.........ultimately i want one kind of hacking to directly enter into zope .... Thanks in Advance...