This built-in predicate closes all streams except the standard input and output stream.
see also: at_end_of_stream/0 at_end_of_stream/1 close/1 close/2 current_input/1 current_output/1 flush_output/0 flush_output/1 open/3 open/4 prolog I/O set_input/1 set_output/1 set_stream_position/2 set_stream_property/2 stream_property/2
| Example | |
| close_user_streams. | all streams except the standard input and output stream were closed |