Section 14,1: 3f_library_routines

 3f library routines (U*X on RISC)

 DEC Fortran library routines (in reference page section 3f) that
 handle the various differences between DEC Fortran and C in
 argument passing and data types.  Some 3f routines are language
 interface routines that make appropriate system calls or call
 library routines.  You can call these routines from DEC Fortran
 programs.  For a list of 3f routines, see the intro(3f) reference
 page.