If port sharing is not enabled, then one user at a time can access a device connected to a serial port.If port sharing is enabled, multiple users can simultaneously access a device connected to a serial port. If two users have write access, only the first of the simultaneously connected users can write to the device. The second user who connects to the port gets read only access.For accessing serial ports using the Java applet viewing window, the Java 2 Runtime Environment (J2RE) or later must be installed on the computer and the Java plug-in must be registered with the browser being used. See the AlterPath OnSite Installation Guide for details.