Embed Grafana portal inside our dashboard

Hi All,

I am new to Grafana and currently exploring tool capabilities.
The use case is

a) When a user logs in into our dashboard and clicks on the link he should be able to open grafana dashboard page without authentication,
Is there any code snippet which showcases such use case that an authenticated user can open the grafana dashboard page?

b) When the user clicks on link different parameters needs to be passed to Grafana dashboard so that the graph value may vary based on the user or logged in customer, Do we have any example or code snippet showcasing such usecase ?