Alright... So i have a pair of headphones, But i want to plug it into TWO computers, At the SAME TIME, I want to plug my 3.5mm Plug into a little thingy, That has Two more Long corded 3.5mm cords coming out of the other end so i can connect my headset into two computers, Is there such a thing? And if so, What is it called?
You could ghetto-rig it by using an airplane adapter and two extension cables. When I was travelling back from Germany a couple years ago my friend and I found out that you can plug the airplane adapter things into two separate audio sources and each source will act as one channel. It was amusing listening to Tool in one ear and Beethoven's 9th in the other.
EDIT: It would be 3.5mm cords to adapter, adapter to headphones.
I'd recommend using it's headphone or line out into a headphone amp, as I want to say the mixers headphone out has something stupid like a 50 ohm output impedance.
I would run the audio out from one of the computers to the line in on the other, then connect the headphones to that one. All you'd need for that is a male to male 3.5mm cable.
A Dual 3.5mm male to female would not work. I'd just look for a good inexpensive mixer. You could also use a home theater receiver. Some receivers have a headphone jack or RCA outputs. Either way, you would also need 2 RCA to 3.5mm cables. If you're going with the mixer you'd also need an adapter for whatever inputs the mixer has (most likely RCA also but sometimes 1/4).
i can't say if the the interference of two inputs would be an issue as far as a listening standpoint, but from an electrical standpoint there's no reason a splitter wouldn't work
Look for a 3.5 to 3.5 to 3.5 "Y" splitter then, if you need more line, a female 3.5 to male 3.5 cable and be sure to heat shrink or electrical tape the female to male ends together.