If 4-Axis turning is available in the current workcell, the HEAD 1 and HEAD 2 options will allow you to specify which head is to be used for the NC sequence (HEAD 1 is the default).

You can synchronize CL output of NC sequences created using Head1 with NC sequences performed on Head2 by using the Synchronize option on the MACHINING menu.

If you perform 4 Axis Area turning, the HEAD1 and HEAD2 options are grayed out, because the system will automatically use both heads for this NC sequence.