vb3 Forced login on custom page?

[Dolby]

I currently have a custom vb3 page (with php) that only mods can see (using vb3 usergroupid's) however I want to force them to login again to see this page just like when they use the modcp. I cant figure out how the modcp/admincp forces users to login again otherwise I could figure it out.

I just dont want my mods logging into a friends computer and then there friends can see this page because they forgot to log out. I need a forced login every time the session expires.

I just need to be pointed in the right direction in how this is done.

Thanks.