code/modules/paperwork/faxmachine.dm

/proc/get_fax_machines_by_department	Retrieves a list of all fax machines matching the given department tag.
/proc/send_fax_loop	Handles the loop of sending a fax to all machines matching the department tag. Returns `TRUE` if at least one fax machine successfully received the fax. Does not include sending faxes to admins.