There shouldn't be any problem with that setup as long as the diagonal angle through any walls isn't too great.
Code:
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└────────────┴────────────┘ High angle through walls - bad
┌────────────┬────────────┐
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└────────────┴────────────┘ Low angle through walls - better
I assume from what you've said that you don't want a separate access point.
In that case you've got 2 options.
1) Get the Asus WL-138g V2 (or the WL-138gE for extended range) with SoftAP for one of the systems - it can act as an access point. You can then use it as a bridge to a wired network or to the internet. This may be available on other Marvell based wireless cards too.
2) Use any wireless cards in Ad Hoc mode. You can still do what you need, but it is messier and connecting the remote pc to the internet is not as simple, but it can still be done.
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