Developers at Citrix have been doing some guerilla marketing at Macworld Expo, holding impromptu demonstrations of forthcoming app allowing iPhone users to run Windows. The app is actually an iphone version of the company's XenDesktop thin client software. The virtualization software supports most Windows XP and Vista applications.

In a demonstration for MacNN, developer Chris Fleck showed an iPhone smoothly operating several Windows applications, and displayed a Windows Desktop. Fleck was also able to perform a cut and paste operation within PowerPoint.

Fleck says the company has received a "positive" response from Apple on its efforts, although there's no word when the Citrix iPhone app will be approved and released. He says the app will be made available for free to lure more businesses to its XenApp server software.

Citrix apparently sees a bright future for the iPhone in the medium-to-large business market. Fleck says "demand is coming from the top down," as executives, doctors and other professionals adopt the iPhone and urge their company IT department to support the platform.