NDES: include username and password for http://myNDES/certsrv/mscep_admin/

Hello

I have setup my NDES to generate challenge password (one time password) with a default equals to 5.  I have couple questions:

1.  I need to get a challenge password automatically (without human intervention) for each end user; so I need a way to bypass username and password login prompt my Microsoft.  My question is how do I include username and password to http://myNDES/certsrv/mscep_admin/ ?

2. Is there a NDES APIs in Java? THanks.