This configuration variable applies only to UNIX systems. Some UNIX machines can restrict access to the machine based on various parameters. If you want to include those restrictions in AcuConnect, set the USE_SYSTEM_RESTRICTIONS configuration variable to "true". The default value is "false".
This configuration variable is available only on UNIX servers and is used only if the SECURITY_METHOD configuration variable is set to "LOGON".
The server uses the loginrestrictions() function to implement this feature. Ask your system vendor for information about this function and how to establish restrictions.