LabVIEW and queues examples, http://search.ni.com/query.html?col=alldocs&layout=Example&qp=ContentType:Example&qt=labview+queue
Imaq ring sequence examples, http://search.ni.com/query.html?col=alldocs&layout=Example&qp=ContentType:Example&qt=imaq+ring+sequence+labview+
Hope this helps.