gistfile1.js

var content;
var casper = require('casper').create();

function getContent() {
    return document.querySelectorAll('html')[0].outerHTML;
}

casper.start('https:site/login.html', function() {
    // search for 'casperjs' from google form
    this.fill('form[method="post"]', { 'login': 'login', 'passwd': 'pwd' }, true);
});

casper.then(function() {
    // the content dumped here is from the page loaded for signed in users 
    // ie session is persisted
    content = this.evaluate(getContent);
});


casper.run(function() {
    // echo results in some pretty fashion
    this.echo('content' + content);
});

this demonstrates that session is persisted across casperjs session