[imp] integration with horde/imp

[Koenig Testing Account]

Hi there!

I am integrating horde with some costom made php pages, 


1. I want to use the username for my costom made php pages after the user has logged in to horde. How can i get it.

2. I 'm maintaining passwords in our mysql table also, if the user changes the password it is required to reflect the same in our table also. How to go about it. Or Otherwise how to remove change passwd section from imp/horde 

I am using 

Linux RedHat 7.3 (Kernal 2.4.18-3)
horde(CVS) 
imp-2001a-10
php(compiled)-4.0.3
Apache-1.3.23-11


Pl. Help - :)