If you use ICL frequently you will find it convenient to define your own
commands. We have already met one way of defining new commands. This is
to write an ICL procedure as described in Chapter 3. There are several other
ways of defining new commands which are described in this chapter. If you
have many commands which you want to use frequently it is convenient to
put these into a login file which will be automatically loaded each time
ICL is started up.
ICL The Interactive Command Language for ADAM