procmail with qmail problem

hello all
       i successfully created the recipe file for everyuser but i have a 
problem .
It is that how can i manage in the .qmail file or how i send a value to call 
the respected user recipe.
i mean for example i login and in .qmail file
where i give the path of procmailrc file but how i come to know which user 
promailrc file is called for filteration.
plz give me idea.
Appreciate every ideas.
thanks with regards and waiting for ur reply.