Custom Applications

Hi GT

We develope some custom applications based on WL time to time. Would you please help us in below cases:

1. Till now, we had our authentication on our applications but from now we are going to do the authentication via WL. Would you please tell us how we should do it? let me explain more. Let's consider that the user has logged in to WL, we want to give the user the ability to open our applications without extra authentication (as he/she is already authenticated by WL). Which parameters we can pass from WL to our application to find out if the
user who has requested the application is authenticated or not or has active SID in WL? After passing that parameter, how should our application check the passed parameter?

2. We mostly host our applications on another server and not on WL server. We want to put those applications on the same server which WL is. Please advise us how to host it on WL? We have copy all files to /home/application-name/ and do Nginx configurations, but what is important on our side is that to know:

A. PHP Version installed with each version of WL version on server.
B. As we install MySQL as DB, we should install that in a way that no conflict happens.