Evaluating make(); runs make -k in a sub-shell and displays its results in a new Shell mode window. When make is finished the contents of this window can be:
bm_search.c:128:syntax error get_file.c:97: syntax error scroll.c:234:syntax error
You can then use the Ctrl-x g command (see go_next
§5.10 page 
) which reads the lines in order (from top to bottom),
opens a new text window if needed, loads the erroneous file and goes
to the error location. After each Ctrl-x g, the cursor moves to
the next line in the error list. The first Ctrl-x g you type
goes to the first line of the current result.
In the same way evaluating grep ("GetBuffer *.c"); searches the string GetBuffer through all files with .c suffix. With the Ctrl-x g command in the result window, you can easily navigate through the corresponding files. It is useful when you want to modify a string which appears in many files. For instance, it may help you to add an argument to a function or to change its name.