HOW DO I>...

HELLO, I am a person very new to procmail programming. I have the
following question.

in the recipe for procmail,
:0 c 
/path/to/directory/.

procmail creates a serially numbered file ( one for each mail)
I want to do some processing on this file. how do i get the file name
from 
within the procmail recipe? 
I.E is there a way to keep the serial numbers and get the file name so
that I can pass it to a script?

Thanks in advance for any help
Srivatsa