Virtual Scanning or remote scanning software enables a user to use a locally attached twain compliant scanner in order to remotely scan to an application hosted on Citrix or Terminal Server. Although this sounds like a fairly simple function these applications can be extremely complex and difficult to make. The main reason is compatibility, if you think about the amount of different devices and software the application has to work with it is mind boggling. Here are the integration points you need to consider when evaluating this application: