Standard Library procedure that opens or closes an output file for LN03 graphics output. The file can then be printed on an LN03 printer.

filename—(optional) The name of the file that will contain the LN03 graphics output.

None.

To open a file for LN03 output, enter the following command:

LN03, 'myfile'

where myfile is the name of the file that will be sent to the LN03 printer.

To close the output file, call the procedure without a parameter.