L1, L2 Visa

I had my visa interview on 12th July (Biometric- 3.15PM) and 13th July (Consulate - 9AM).

Biometric-
Please note that Mobile phone is allowed inside. You would be asked to Switch it off , but you can carry it inside the VAC.
The process is very simple inside. You need to stand in the queue as per your interview slot.
The required documents are DS160 confirmation page, Interview confirmation letter and Passport.. (That's all). Take the documents in a transparent folder as bags are not allowed inside.
After initial verification of your documents is over ,
you will be issued a token number (pasted to your passport's outside cover) and asked to stand in a queue. The token number would be displayed in monitor and you can go to the counter when your turn comes
to give your biometric test and then your photograph will be taken in the same counter. The whole process takes around 2 minutes.

Consulate interview:
Nothing is allowed inside apart from your documents. Even you will be asked to remove you watch. Digital watches are not even allowed.
My interview was at 9AM. So I reached the venue around 8.15AM to see around 200 people are already in the queue outside the consulate office.
The verifying officer allowed me to get inside directly as my interview was at 9AM. (Intentionally I did a polite inquiry whether I should stand in queue as my interview slot was at 9AM and the queue was too long)

After getting inside, all L1B visa applicants are asked to arrange the documents in this order.
I-129S (8 Pages) + I-797 (1st page) (3 sets)
DD of 500$
Passport..
These are the only documents required for your visa interview.
Other documents are not required, unless the Visa officer asks you to explicitly show to him. Given the duration of interview is so short,
this would be most unlike event, but for safe side its better to carry all the documents which are mentioned in the site.

You need to visit to three counters before you get in queue for your actual Visa interview.
1st counter: Submission of DD and get a receipt for the same. The officer will staple the DD's acknowledgement to one set of I-129S.
2nd counter : The officer will ask you for your passport only and make some entry in the system.
3rd counter : your finger prints would be taken again . (kind of biometric)

Once these formalities are done, you will be asked to the queue where people are waiting to give their actual visa interview.
After waiting for 20 mins , I was asked to go to a particular counter, where another interview was going on . You should be able to hear the conversation on the nature of questions gettting asked.
Once the other person's interview got over , the Visa officer shouted Next.

Me: Good Morning Mam.
VO : Very good morning, how are you?
Me: I am good Mam, how are you?
VO: I am good too, than you.

VO: Which company do you work for ?
Me : I am working for company xxx for a period of xx year and zz months.
VO: (stopping me in between), please answer to the point what was asked for. (I realized I should not have told the number of years)
Me: Ok sure Mam.

VO: Whether you would be working at our parent office Or at Client place?
Me: I would be working at the end user site for some time to support them during the implementation phase of the project. (Intentionally I termed client site as end user site)

VO: So you would be working at the client location. Who is your client.
Me: We are a product based company and there are many clients who are using our proprietary product. (I tried avoiding my Client name by giving this answer which obviously she didn't like)

VO: (In a bit irritating voice) Please tell me the client name for which you would be working .
Me: The client name is YYYY.

VO: (I believe she goggled my client's name ) What your client does?
Me: They are into etc. etc. field and they are the one of well known retailers xxxx through out the United states.

VO: Which product you have specialized knowledge?
Me: I explained her on the nature of the product. (She was aware of the product as she would have already heard the same product name from many of our company's applicant)

VO: How much customization was involved in this project?
Me: This is our company's own product and no customization specific to Client was done. The customer YYYY and many other profitable retailers around the world
would be using this product.

VO: What would you be doing at the client site?
Me: I would be supporting the implementation for our product during integration testing. I would be supporting only our own proprietary product using my specialized skills of this product and
I would be reporting to mr MMM who is a technical Architect during my tenure.

VO: How long would you want to be there in US?
Me: I would be entering the U.S for a period of 4 to 6 Months and would be back to India to resume my normal duties after my assignment is over.

VO: Did you directly deal with your customer during the development phase?
Me: No, I was never involved in any kind of discussion with the customer. It was the onsite business manager and design leads who were responsible for dealing tihe the customer.

VO: How long you have been working with this product?
Me: I am working on this product from the day I joined the organization.

She started typing for more than 2 mins in the system. I was worried as I felt the interview didn't go that well and it was not in the same expected zone based on which I was preparing for couple of weeks.
The questions were mostly client related and I was forced to tell my Client's name (which I believe is not a good thing).

After 2 mins of so, she started stamping on all of my 3 I-129S copies. She kept one and returned the other two saying
I am approving your visa, All the best!!

I said Thank you so much mam. You made my day.
My suggestion would be: Be honest on what you are answering and try to be as confident as possible.
We may not always get the standard set of questions, so be prepared. Wishing you all the best.