Problem definition There is gap between instructor and students to interact to each other because of: Big halls Big number of students Data show resolution Voice problems We used technology to solve this problem. Wi-Far Data Show Wi-Far Data Show is a Server-Client program helps students to interact with instructors through: Show the screen of instructor's PC on theirs PCs, smartphones or tablets. Make a voice channel between them to make it easy for the student to deliver his voice to instructor. Save all session as PDF if you want. Server Windows Mac Ubuntu You can close the program and it will run in the system tray All screenshot of server program: Client (Desktop) Client (Android) Client (iOS)