A terminal apparatus is constituted by an added data input section, a writing start/completion detecting section, an input position detecting section, a connected terminal selecting section, a specific terminal information input section, an added data storing section, a specific terminal information...http://www.google.com.hk/patents/US6473784?utm_source=gb-gplus-share專利 US6473784 - Information processing apparatus for sending and receiving written data with identification information
