CITRIX 4.6 secure gateway, can you have more than one in a farm

I want to create multiple secure gateways im my farm is it possible and can they do fail over?
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Fail over...not really as far as I know.  You can certainly load balance them.  I would suggest using a low cost hardware load balancer since you can use it to balance tons of other "services".  You could probably use either of the 2 lowest units:

These will sense servers that are down with a telnet-like connection it performs on a schedule.  I put one of these up in a client's network and had it running with 1 hour of downtime.  I ripped out a bad NLB cluster and retooled 3 terminal servers and 3 web servers to use a 340 model.  All of their issues went away.  

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