The EDIT command allows you to invoke an external editor to edit the contents of the buffer, or to edit the contents of an operating system file:
ED[IT] [filename
]
where:
Is the command, which may be abbreviated to ED. The EDIT command with no parameters allows you to edit the current contents of the buffer.
Specifies an external file to edit instead of the buffer. The filename may include a path and an extension.
EDIT, and all the other editing commands, are described in Chapter 2.