%N htell %F $MIR/src/subs/hio.c
%D Return the default offset (in bytes) of an item.
%P pjt
%: low-level-i/o
%B
FORTRAN call sequence
        integer function htell(itno)
        integer itno

  This returns the current default offset of an item, which is used
  when reading/writing using hreada/hwritea.

  Input:
    itno        The handle of the item of interest.                     
