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There is an easy possibility to share caches between users of c:geo if both devices support near field communication(NFC):
Make sure NFC is enabled on both devices. Then just open the cache details of a cache on one device and place it back to back with the second device. The first device should now show a reduced size c:geo window, which you now tap on to send the content to the second device.This will automatically start c:geo and show the same cache on the second device.