Each asynchronous port can be configured for several different functions, giving the PortMaster 4 configuration more flexibility. However, each port can carry out only one function at a time.
For example, if a port receives a dial-in user login request, this port cannot be used for anything else until the current session is terminated. The port is then available for dial-out use or any other purpose specified when the port was configured.
See the PortMaster Configuration Guide for more information on the uses of asynchronous ports.