"new"       returns the handle for subsequent calls to following
             functions. Argument is the name of the application.
             Optionally can be followed by two arguments for "IN" and
             "OUT" filehandles. These arguments should be globs.

 "readline"  gets an input line, *possibly* with actual "readline"
             support. Trailing newline is removed. Returns "undef" on
             "EOF".

 "addhistory"
             adds the line to the history of input, from where it can be
             used if the actual "readline" is present.