Need an effective idea about Pixelmator graphic software

Which operating system is needed to set this up software? What is the hardware configuration needed? Can I use this any touch screen monitor? What is GPU-powerful image processing? Can this support photoshop image layer as well as any other image file formats? Can I export all types of image file formats by using Pixelmator graphic software? What is life application and what is the impact of it? Can I install any plugins into it like adobe photoshop? What is Core Image and Automator technology, in it? Thank You