How do I run Mavericks in 32 bit mode?

I would like to run Mavericks in 32 bit mode. I have tried restaring and holding 3 and 2, maybe I am doing it wrong?? is there a way to check to make sure I have have done it correctley?
Thanks

I am not aware of Citrix doing a VPN server product although I have not gone out of my way to look for this and it maybe embedded into their solution for remotely running VMs or Virtual Desktops.
However some general comments -
Safari on a Mac is a 64-bit capable app
Mavericks is a 64-bit only operating system but can run 32-bit applications as well as 64-bit applications
Google Chrome is still only 32-bit and will only run as a 32-bit app even in Mavericks
Java 1.7 on a Mac is 64-bit only and hence will not work in Google Chrome
Apple do not support Java 1.6 which was 32-bit and 64-bit capable in web-browsers any more
In general a 32-bit app can only use a 32-bit component, e.g. System Preferences needs to run in 32-bit mode to run a 32-bit preference-pane, and likewise a webrowser needs to run in 64-bit mode to run 64-bit only Java 1.7
Many if not all SSL based VPN clients use Java (ugh!)
Juniper (double ugh!) still only have a 32-bit version of their host-checker which will not work directly with Java 1.7, to get round this you have to run the web-browser based Java-applet version of the host-checker in Safari (remember Google Chrome does not support Java 1.7) the web-browser based version of the host-checker then uses the 64-bit Safari to execute and hence can use Java 1.7
Running Java applets in a web-browser is the most insecure and risky approach going and the approach by far the most likely to result in a Mac (or PC) being infected by malware these days
Because of the considerable security risks of running Java applets via a web-browser Apple periodically disable this function when new exploits are discovered in Java until Oracle comes out with a security fix, this can result in all your Mac users being unable to access your VPN system for several days
It is not compulsory to use Juniper's host-checker but this is up to your corporate IT team, if they have made it compulsory at their end you have to run it, for those unaware it checks things like the fact you are running an approved and up-to-date anti-virus product, Cisco have a similar tool called Network Access Control agent
To summarise if you are using a system which uses Java then it almost certainly needs to be a 64-bit compatible.

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