Click on the Apple button on the top left corner, and click "about this Mac".
A window with the specs of your Mac should appear.
For Windows
Type dxdiag in the search bar in the Windows menu and click dxdiag.
Click on the "Display" tab of the dxdiag window to see your graphics card information.
Fill in your PC information to see if it runs Shelter
CPU
How do I know specs like this?
GPU
RAM
2GB
4GB
8GB
16GB
32GB
System
Windows
Linux
MacOS
Confirm
Requirements
Shelter
Might and Delight
Minimum:
166
CPU: 
2.6 GHz single core
GPU: 
GeForce 400 series, ATI Radeon HD 2xxx
RAM: 1.0 GB
Storage: 2.0 GB
OS: 
Windows XP SP2
Homepage
Desktop Site
Fill out the specs below:
How do I know these specs?
CPU
GPU
RAM
2GB
4GB
8GB
16GB
32GB
System
Windows
Linux
MacOS
Confirm
Where do I find these specs?
For Mac
Click on the Apple button on the top left corner, and click "about this Mac".
A window with the specs of your Mac should appear.
For Windows
Type dxdiag in the search bar in the Windows menu and click dxdiag.
Click on the "Display" tab of the dxdiag window to see your graphics card information.