Returns the pointer position for the file opened "on" the currently selected file number (selection is made through fd.filenum). Returns zero if no file is currently opened or the file is empty.
0 to fd.filesize+1 (except for fd.filesize= 0, in which case fd.pointer= 0 too).
Writing To and Reading From Files,
fd.getdata, fd.setdata, fd.setpointer, fd.filesize