The tab multiplexer connections is used for the management of the connections to the multiplexer A and B.
There are two different kinds of connections:
| register |
the data out of the register will be connected with the multiplexer |
| constant |
the data in of the multiplexer will be wired with the value of the constant |
Pressing 
adds a new connection to the multiplexer. Pressing 
deletes the selected connection. Using the arrow buttons the selected connection can be moved up and down.