[bdbxml] Lazy evaluation using nxqd

Hi
I am working upon large set of documents and most of the times, the result 
set exceeds 500 entries. Processing all these entries in one go takes time 
and memory as well. I checked out nxqd but cudn't find any method to specify 
a 'lazy evalution'. The idea is that as soon as the result set exceeds 50, 
they are returned to client. Also, later I am able to retrieve the next set 
of of 50 results and so on.
So, wanted to know if there is a way to set the evaluate type to 'lazy' 
thro' nxqd client along with the number of results you want in one go; or if 
it is being implemented currently. Also, how to use it as well. 

Thanks
Regards
Manish