How to retrive info from query string and pass into component in Lithium

Hi Support Team,

I have tried to check how component in Lithium queries data for 4 pages above.

There is an issue need to get advise from Lithium support.

Scenario:

Once we access URL as below 

• http://community.digi.com.my/t5/Blog/bg-p/11112222
• http://community.digi.com.my/t5/Reviews/bg-p/Reviews
• http://community.digi.com.my/t5/Let-s-Inspire/bg-p/LetsInspire
• http://community.digi.com.my/t5/New-Digi/bg-p/NewAtDigi

We want to get last part of URL in this case is "Reviews" and then pass that parameter to component name "recent-blog-posts"

And in component we will get parameter by using code as below

<#assign category = http.request.parameters.name.get("category", "") />

Question: 

1. Where should check that component is used in admin of Lithium?
2. How can we parse parameter from URL after /bg-p and then pass that parameter to component recent-blog-posts?
   1. 11112222
   2. Reviews
   3. LetsInspire
   4. NewAtDigi

Thanks,

Mickey