A maximum of two MPC paging consoles can be connected to the main matrix. This means it is possible to make a page from two locations. However it is not possible to make two pages simultaneously.
To connect the MPC console to the system you need four wires. It is advisable to use a shielded cable (a microphone cable for example) for the audio link (pins 1 and 4). You can use a regular UTP cable for the data link (pins 2 and 3)