Macros are lists of commands. Any series of operations which has to be performed frequently is a good candidate for being a macro.
Macros can be written manually: they are just ASCII files, each command
occupying a line (lines starting with any non-alphabetical character are
considered comments). But the real power of macros is that they be recorded
during the normal usage of
ne. When the recording terminates, the
operations which have been recorded can be saved for later use. Note that each
document has a current macro (the last macro which has been opened or recorded).