iotest.js

var fs = require('fs');
var sys = require('sys');

var stream = fs.createReadStream('./sample.txt', { 'flags': 'r',
                                           'encoding': 'UTF-8',
                                           'bufferSize': 4 * 1024});

var stream2 = fs.createReadStream('./sample2.txt', { 'flags': 'r',
                                           'encoding': 'UTF-8',
                                           'bufferSize': 4 * 1024});

stream.pause();
stream2.pause();

stream.on('data', function(data) {
    sys.log(data); 
});
stream.on('error', function(exception) {
    sys.log(exception);
});

stream2.on('data', function(data) {
    sys.log(data); 
});
stream2.on('error', function(exception) {
    sys.log(exception);
});

stream.resume();
stream2.resume();