[Zope] login page problem

[prabuddha ray]

I'm creatin a customised login page template using districtname, user
name and password.
i got halt in d logic for password checking. 
after submitting d login form how do i call d same page if the passwd
is wrong along with d req params passed? do i need an ext python
script for this redirection.
also tell how to set session data in ZPTs from the form fields?





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