Innovations such as large touchscreens as seen on this Lenovo all-in-one PC are making stationary computers more engaging and multi-functional than traditional desktops. An estimated 16.4 million AIOs are expected to sell this year, a 20 percent increase from 2011, according to research firm IHS. While total sales remain a fraction of 132.3 million traditional desktop PCs forecast to sell this year, AIO sales growth is attracting attention leading into the back to school shopping season.