How can I direct specific traffic through a given network connection?

hopefully I've phrased the correctly appropriately!

Using windows 7 Pro SP1

On my laptop, I have to use both a wired and wireless connection - some traffic (eg accessing specific systems) I can only access through the wired connection - and others only through the wireless connection.

Both are company on-site connections - they're just not very joined up.

At the moment, I have to switch between them through the day - if I leave both on, it's hit or miss which connection windows will try and use (but usually the wired), so I unplug/disable the one I don't want and then change back when I need it.

Is there a better way of directing specific applications / protocols through to a specific connection?

Or, if this isn't possible, can specific URL's be re-directed instead (this would at least make switching less frequent!)

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