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+USB_ModeSwitch is (surprise!) a mode switching tool for controlling "flip
+flop" (multiple device) USB gear.
+
+Several new USB devices (especially high-speed wireless WAN stuff, there
+seems to be a chipset from Qualcomm offering that feature) have their MS
+Windows drivers onboard; when plugged in for the first time they act like a
+flash storage and start installing the driver from there. After that (and
+on every consecutive plugging) this driver switches the mode internally,
+the storage device vanishes (in most cases), and a new device (like an USB
+modem) shows up. The WWAN gear maker Option calls that feature "ZeroCD (TM)".