This icon will activate the background fax-spooler program. If it is already operating, you will get the choice of removing the existing application (stopping it), or replacing it with the new version. Note that in normal operation the main AmigaFax program will start the spooler for you when you queue a fax for transmission, or you will run it up automatically in your startup sequence. You may wish to replace it if you have modified the configuration file settings.