Can this connect, let's say a keyboard to two devices?

I am wondering this too... It makes sense that it might but I have a feeling that when they are both plugged in that it might confuse your keyboard and it wont work at all.

1. How long is this cable? 2. can this cable be used to connect one printer to 2 computers?

that is exactly what i tried to do with it. The large female port is the only one that will print, and I am sure of this because i switched the computers around frequently. For some odd reason, the smaller port is unable to print. The cable is about 9 inches long. If you want to connect two computers to the same printer, you may have better luck with a different printer but I imagine it will be a waste of time.