How to trigger AB b800 strobes using a Nikon D3100?

I have a Nikon D3100 Camera (which the hotshoe & flash do not support TTL), Alien Bees B800 Main Light & 2 other speedlights I need to trigger with my Cowboy Studio 4 channel Trigger/Receiver. What do I need to make this happen?

The hotshoe and flash on your camera do support iTTL flash control, just not with an Alien Bees flash unit.

The trigger goes in the hot shoe, of course. The receiver, depending on what you have, would go to one of the hot shoe flashes or the AB unit. If the receiver has a PC socket, that would be the way to go. You connect the AB to the trigger via PC cable. The other two must have optical slaves to work with this setup.

If the 2 other flash units do not have optical slaves, then you have a problem. If the receivers only have a hotshoe connection and no PC socket, then one of the speedlights will need to be on the receiver and the AB set to optical slave. You won't be able to fire the second speedlight.

The best solution is to get 2 more receivers and put all 3 flash units on radio slaves. One receiver needs to have a PC socket, or Cowboy Studios doesn't have those, then 3 hot shoe receivers and a Nikon AS-10 adapter, which mounts a PC socket into a hot shoe.

The D3100 does support iTTL via the hot shoe. The D3100 does NOT support remote control of flash units wirelessly using the CLS system.

Virtually any manual triggering system will work - Pocket Wizards, etc. To trigger your off-camera strobes. However, you may need to use slave flash/manual exposure mode unless both the flash and triggers understand iTTL as well (some do, but most don't).

You can also buy a Nikon SU800 trigger module that sits atop the hot-shoe, but this is for Nikon speedlights only, as it is an infrared triggering system.