A loan has a fixed repayment schedule, such as 60 months. At the end of 60 months the loan is paid off and released. With a fixed loan the balance does not become available as it is paid back and they normally have a fixed interest rate. A line is generally for a much longer term, in some instances for as long as you own the home. With a line, as the balance is repaid it becomes available for use again.
Lines usually have a variable interest rate.
You may give each page an identifying name, server, and channel on the next lines.