Service Port 

Port number that Calendar Server listens on to provide Web (HTTP) access to users. The default is 80.

Maximum Sessions 

Maximum number of Calendar Server sessions to allow concurrently. The default is 5000.

Maximum Threads 

Maximum number of Calendar Server threads to allow concurrently. The default is 20.

Number of Server Processes 

For Solaris: Maximum number of Calendar Server processes to run concurrently. The default is the number of CPU's on the server where you are installing Calendar Server. 

For Linux: Only one process can run at a time.

Runtime User ID 

UNIX user name under which Calendar Server will run. This user name should not be root. If the account does not exist, the configuration program will create it. The default is icsuser.

Runtime Group ID 

UNIX group under which Calendar Server will run. If the group does not exist, the configuration program will create it. The default is icsgroup.