ClockworkMod developer Koushik Dutta has posted a test version of what he claims is a potentially undetectable tethering app. ClockworkMod Tether Alpha lets Linux, Macs, and Windows PCs borrow an Android phone's 3G or 4G connection as though it were a proxy, not a router. The technique theoretically makes it "not blockable," as carriers are checking for the TTL (time to live) of data coming from a desktop OS, which would be masked by a proxy.