Sending a contact from one device to another

You can do this by-
Sending the details through email/texts/messaging
Using Bluetooth to send contact details
Write the details down for the other person to insert themselves
Telling the person the details
Using a memory card or USB stick to transfer data

Protocols

Protocols are simple rules and scripts that are created to run certain tasks.  For example, texting, photo sharing/uploading, Facebook messaging, phone calling and internet searching, these tasks are triggered/started/performed by protocols.