yes, multiple windows.. but thats not all, the menus are terrible and doesn't have the power of Photoshop
Check this out it was made by one guy and supports multiple platforms... you can download a trial version..
IF your using Windows give paint.net a try free
http://www.eecs.wsu.edu/paint.net/
If you want to try some Beta software try out Microsoft Acrylic(Expression Graphic Designer)
Pixel seems better than many other commercial products out there. But it's not freeware; it's shareware that isn't even fully usable: It imprints "Demo" over everything. In all honesty, the price for the beta version $30 is quite a steal... the package will be placed with the big boys at $100 once they are sure there are no more bugs. But my quick impression is that of the big boys, it'd probably be my favorite, despite some nonsensical behavior, which I quickly discovered how to avoid. For instance, the first "new" page was "white paper," which apparently is an uneditable layer.