It would not emerge practical to type an entire program each time it is required, and to avoid this it is possible to store a program on the disk, with the vast advantage that by being already assembled it will not be essential to run Debug again to execute it.
The steps to keep a program that it is previously stored on memory are:
Acquire the length of the program subtracting the last address from the initial address, as expected in hexadecimal system.
Provide the program a name and extension. Locate the extent of the program on the CX register.