How to find whether MI is installed in my landscape?

Hi

I would like to know, how/where can I check whether my landscape has mobile infrastructure components got installed or not? I've seen in sld - products where mdk all versions are there.

Is it require to take any post installation steps for utilizing these mobile infrastructure applications?

I was just browsing and came to know that Mobile client and server are existed. Mobile Client can be installed at Mobile devices and Laptops. Mobile server will be in WAS. Is this correct?

Please explain in clearly.

Thanks.