How do I run Lightroom 3 and 4 simultaneously?

When I try to run LR3, while having LR4 open, LR3 magically knows that there is already another version of lightroom running and will, extremely inconveniently, refuse to run, instead moving focus to the already open LR4.
Is there a way to make LR3 actually run at the same time as LR4, instead of making the decision that I should want to use LR4 exlclusively for me?
Some catalogues we work with cannot be upgraded to LR4 format yet because they are shared with clients, and not all clients are on LR4 (hopefully, "yet"). Being able to perform edits in LR4 and then moving the edited-exported copy into an LR3 catalogue is required, and this is an incredibly painstaking chore if it involves closing LR4 just to start up LR3.

Indeed, installed in separate folders, and the executables have different names. This does not seem to matter - somehow, LR3 is able to query whatever silent Adobe service is runnign that some version's already running, and refuses to load. The same happens the other way around - first running LR3 and trying to run LR4 will simply not run LR4 and instead move focus to LR3.
Rikk's suggestion will have to do for now, but it's still a bit of a chore to have to artificially chop up the workflow. Does anyone know what's responsible for telling LR that another version's already running? (can that be temporarily disabled and then turned back on after LR3 and LR4 are running? =)

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