An ITIN (Individual Taxpayer Identification Number, sometimes called a PIN, Tax ID or Taxpayer ID) will serve as your identification number for filing your tax returns. If you do not qualify for an SSN, you will need to apply for an ITIN.
Active Server Page Extended ASP.NET script. An aspx file extension is associated with Active Server Page Extended format used by Internet Information Services (IIS) web server with server side scripting language ASP.NET used to dynamically generate websites. Generated output from an .aspx page in your browser is common html page.
A: ASPX stands for Active Server Page Extended File, and it is developed by Microsoft. It is a type of ASP.NET Web file that can feature business logic, Web controls and presentation. Also referred to as .NET webforms, ASPX pages are usually written by Microsoft Visual Web Developer and are intended to work in the ASP.NET framework.