When two nodes are connected via the control/dependent specification, how can the forces/moments transferred by that connection be directly read?
The control/dependent specification is essentially an infinitely stiff link connecting two nodes. There is no way to directly read the forces/moments transferred through this connection, however there is a work-around. Instead of using the control/dependent specification, you can use a rigid link member to connect the nodes (i.e. you can simply define a beam between the nodes). The goal is modeling a connection between the nodes that is equivalent to that established by the control/dependent specification, so this rigid link member must be (essentially) infinitely stiff. The easiest way to accomplish this is by creating a new material and defining it with a very large modulus of elasticity (E) value. A good rule of thumb is to use an E value 1000 times greater than that of steel (29000000 ksi). Once this material has been defined and assigned, the rigid link member must still be given section properties. Since the material is so stiff the actual section assigned to the ink member doesn't really matter, so a simple prismatic shape with a circular cross-section is often the best choice (a 1 inch diameter is fine.) Member releases can be assigned to the rigid link to control which forces/moments are transferred. Once the rigid link member has been set up the analysis run, you can go into Post Processing and obtain the forces/moments transferred transferred between the two end nodes using the Beam End Forces and Beam Force Detail tables.