You can grab a viewport as an image file. You can also generate a preview of an animation. These commands are in the Grab Viewport group on the Tools menu.
A viewport grab (Create Still Image File) appears in a Rendered Frame Window, where you can save it to a bitmap format.
A preview (Create Animated Sequence File) can help you preview the animation in your scene. The preview uses lighting but not materials, so it renders much more quickly than a fully rendered animation.
Create Still Image file creates a snapshot of the active viewport in a Rendered Frame Window, where you can save it as an Image file.
Create Animated Sequence File displays the Make Preview dialog, enabling you to create an AVI file or custom file type preview of the animation in the current viewport. You can also render a preview to a specified device.
View Animated Sequence File displays the Windows-standard Media Player to view the current preview file.
Rename Animated Sequence File renames the _scene.avi preview file.