These are specifically the parameters required to log on to Visual LANSA. The other options on the log on dialog are described elsewhere in this guide.
Refer to the following:
3.3.1 User ID
3.3.2 Password
3.3.3 Use Windows Credentials
3.3.4 Partition
3.3.5 Current Language
3.3.6 Task ID
3.3.7 Messages