Queation/Help - domain name restrictions

Hi,

i would like to allow access if the request come from 1 specific application/server. how do i do this using domain name restrictions?

Ex.

1. Application A is hosted in server A (intranet)

2. Application B is hosted in server B (dmz). Can be accessed by internal and external users through different applications hosted in A,C,D servers.

Application B should allow request only users who is coming from Application A. How Application B know the request is coming from Server A?

Note: Application A can be accessed from users local machine.

using IIS 8.5

Thanks,

Ganesh