does anyone know whether Photoshop work with any of the all in one 23-32"computers with touch screens (without a tablet) ?
Photoshop requires driver that use the wintab API for pen support for pressure and tilt. From what I read most touch device drivers do not use these API they use Microsoft Ink APi for pen support which Adobe states lack required features so are not supported. . Only tablets like Microsoft surface pro have the right type of driver. Tablets with Wacom Feel It technology.
As JJMack explained, only tablets that have licensed the Wacom tech will actually provide any access to tablet features, but be aware that most of those still use a much lower DPI touch area than "real" tablets. If you need extreme precision, it may not be enough...