In summary:

1. by default a procedure definition is exported to other
   files

2. if static is used the procedure definition is local to the
   current file

• By default, a variable is visible within its current
  scope, if a variable is defined inside a procedure it is only
  visible within that procedure

• If a variable is defined outside a procedure, i.e., a global
  variable, it is visible to the entire program--it can be
  seen in the current file and any other file that is loaded
  with it.

• If a global variable is defined with the static storage
  class it can only be seen within the current file - other
  files cannot reference this variable

• A variable that is declared extern is defined in another
  file, but is referenced in the current file - C will not
  automatically provide declaration for external variables
  like it does for procedures

March 3, 1998

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C201/TAM