How to interact with browser in VB.NET

I have three website links:

link1.domain.com

link2.domain.com

link3.domain.com

And Three VB.NET Applications:

App1 for link1.domain.com

App2 for link2.domain.com

App3 for link3.domain.com

I want something like whenever I run App1 ONLY link1.domain.com will be available to access, and link2 & link3 will be hidden and not accessable and so on...

I also want my website unreachable when someone tries to access it without the app.

Is that possible?