Terminal-Multi-Line-Option

This example is obsolete
Proper use of ISOS commands achieves the same:

• ZR (ZREMOVE) to clean your local routine buffer
• ZI (INSERT) to insert a line
• ZS (ZSAVE) to name and keep your lines
• P (PRINT) to show the actual content of the local routine buffer

No magic since this was invented at least 60 years ago