Making another secure part of the system

[j.smith1981]

I am wanting to create a management database of products for a company using prestashop.

 

They already have their own fully functioning site which is perfectly fine.

 

But what I was wanting to know is, how would I go to make it so that they can go to a complete solution of their own management, if their not logged in at the present moment say or have timed out of their session for inactivity (for whatever reason), how would I get prestashop to know they have come from say 'new management system'.

 

They are then taken to the prestashop admin page, then when they make a successful login they then get sent to the new admin page I have made (not the prestashops admin page?

 

I hope this makes sense?

 

How can I go about doing this though sorry?

 

Any helps greatly appreciated,

Jeremy.