Section 13,57: SAVE

 Declares that the values of data elements are to be saved across
 invocations of a subprogram.  Statement format:

    SAVE [a[,a]...]

    a  Is the symbolic name of a common block (enclosed in 
       slashes), a variable, or an array.  

 A SAVE statement cannot include a blank common block, names of
 entities in a common block, procedure names, and names of dummy
 arguments.

 Within a program unit, an entity listed in a SAVE statement does
 not become undefined upon execution of a RETURN or END statement
 within that program unit.

 Even though a common block can be included in a SAVE statement,
 individual entities within the common block could become undefined
 (or redefined) in another program unit.

 When a SAVE statement does not explicitly contain a list, it is
 treated as though all allowable items in the program unit are
 specified on the list.

 NOTE:  It is not necessary to use SAVE statements in DEC Fortran
 programs.  The definitions of data entities are retained
 automatically by default, unless you specify the -assume recursive
 compiler option.  (Optimizations may also affect this.  See your
 user manual for more information.) However, the ANSI FORTRAN
 Standard requires using SAVE statements for programs that depend on
 such retention for their correct operation.  If you want your
 programs to be portable, you should include SAVE statements where
 your programs require them.

 The omission of such SAVE statements in necessary instances is not
 flagged, even when you specify the -std compiler option, because
 the compiler does not determine whether such dependences exist.