Final answer:
The port number used by Virtual Network Computing (VNC) for remote screen sharing is 5900.
Step-by-step explanation:
The port number used by Virtual Network Computing (VNC) to provide remote screen sharing between devices is 5900. This port is the default for VNC servers, although it's possible to configure the server to use different ports. Other options like 3389 is associated with Remote Desktop Protocol (RDP), 8080 typically used for alternative web server communications, and 22 is for Secure Shell (SSH) do not apply to VNC.