Password passing

[Jonathon Coombes]

Hi,

I am trying a simple PAM program based on the sample in the PAM  
manuals, but instead of being prompted for the password, I would like  
to pass the password to the PAM authentication mechanism. I have had  
a friend say it has to prompt, but I don't see this as being valid.  
An example would be a smart card system - the card would supply both  
the user name and password without ever being prompted. I presume  
this is done through the conversation, but I was hoping for a simpler  
solution. An example conversation code piece based on the manual  
example would be most appreciated.

Regards
Jonathon