For Windows users who familiar with switching between language with grave accent ( ` ), using Mac input source switching with Command + Spacebar might be difficult. After a long time of confusing, I finally see the light. I just need the same setting for all devices.
All you need is this piece of software Keyremap4macbook [http://pqrs.org/macosx/keyremap4macbook/]. After download and install (in System Preferences), you need to map ( ` ) to Command+Space .
That’s all, now I can use ( ` ) to switch language in both Mac and Windows.