Creating and Deleting Users

Hi,
I need some help creation and deletion of users. I'd appreciate if
anybody can provide me ways to achieve the following.

I have a test domino server [7] where I need to do the following:

1) Need to create some 5000 users. For this, I have programatically
created an import file which has all the 5000 entries, but how can I
go about having the password. [I use the HTTPPassword: field and i use
the same password for all the 5k users.] Everything is importing
fine, except for the password, where somebody needs to login and
change the password. Any other better way to create users
automatically? [user names are like STUser1, STUser2......]

2) If I want to delete 5000 users, it is taking hours, any better way
of deleting users in mass? any scripts?

Thanks in advance,
Sathish