[ns] is it possible to dynamically modify queues' parameters?

[asimon@esoc.esa.de]

Hi,
I have already send an e-mail about that, but I will try again. Maybe someone
have an answer now.
So my question is: does someone know if it is possible to dynamically (i.e.
running time) modify parameters of a queue (like its length) in order to
simulate a shared buffer space among several queues?
Or maybe someone knows an other way to simulate shared buffers. If yes,
please, tell me how.

I would be grateful if someone could answer to me. It would really help me.
Thank you
Audrey