Converse of object

• use: Other storage class specifiers You will see static and extern used commonly.

Modifies a noun

• errno: The POSIX standard says " ... which is defined as extern int errno; " An implementation specification.

• int: The POSIX standard says " ... which is defined as extern int errno; " An implementation specification.

• declaration: The actual variable must only be defined once in the whole program -- you can have as many extern declarations as needed.

• keyword: You can explicitly state that an identifier has external linkage by defining it with the extern keyword.

• variable: Note that, as in character I/O drivers, extern variables are assigned values in the master file when configuring drivers or modules.