Multiple apps one core in cakephp 1.2

I have requirement like this, I currently have a www and www2 folder in which i have example.com n corp.example.com app respectively. I want to make it a single www folder so that i can use only one core. I was able to do this in 2.3 but i am not able to do it in cakephp 1.2. 

What path should i mention in the index.php in webroot ?

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