Security and multiple sites in Appian

Hi,

I have two applications and the respective sites for those applications for now. In future these count of applications may grow.

Now, I got a requirement that I have to provide a common interface which user can use to navigate the respective site based on the application groups user belonging to.

Some users may have access to both sites and some users have access to a single site.

Can someone advise how and the best way to handle the situation. 

Thanks in advance.

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