Immigration Site

Greetings!
I am a US Citizen and have filed I-130 petition for my parents in May 10. My parents are here in the US (since April 10) and have a valid 10-year multiple entry Visa. Their I-94 expires in Oct 10. I wasnt aware that I could file I-130 and I-485 together.

1) While the I-130 petition is still being processed by USCIS, Can I attach a copy of the I-130 receipt and file I-485/other relevant documents for concurrent processing?
2) If so, will filing of I-485 let my parents stay in the US (legally) beyond Oct 10, even though the it might take longer than Oct 10 for them to get their GC?

Thanks in advance, for your guidance!