Thanks for the clues. I tried Specci48's method of googling and got 468 results - a lot to wade through (it searches more than just the forum). Zenerdiode's approach works but relies on you and the poster using the same words "e.g. distance and distance, rather than distance and proximity". Still a useful idea, thanks.
Here is another possible solution: I tried "gps**" as a keyword and got 109 hits back. I haven't determined yet whether it only returns hits where "GPS" is the start of a longer stringe (such as GPSdriver).
Anyway, thanks for the fast answer to my question!
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