It can connect to printers and the internet with WiFi, headsets, speakers, keyboards and footswitches with Bluetooth. It can also act as a controller for other devices or be controlled via Wifi and Bluetooth. It can connect to digital cameras for importing via USB, and connect to external microphones and keyboards via USB.
yes
A modem
by email and other radio devices
The IPad has the ICloud. When you download music on one place it automatically to all other devices. You can also get all kinds of eBooks as well. You must get an IPad.
Messages is used to communicate through text messanging with other iOS users (iPod Touch, iPhone, iPad).
there is an app called pouncer
Wifi, 4G, and Bluetooth.
BUSEach channel, called a bus, allows the various devices both inside and attached to the system unit to communicate with each other
You can't. It can only be on mobile devices such as iPhone, iPad, and those other stuff
serial port to communicate between CPU with other devices such as printer
Servers
Servers