clustering on hp-ux

[niti]

hi All   i wanna setup clustering on my hp-ux box with pop and smtp separate machines. i have got whole qmail setup(pop with smtp) working on both the machines.i m innocent on clustering ...can anybody guide me thru the exact steps on hw to perform it.which clustering s/w 2 b used? and wht patches to b added on the qmail src. i m not able to find a proper documentation on net.   lwq says to setup qmail-qmqpd ..   reply asap   Regards Niti