Detailed Visa Appointment Procedure
Appointments' procedures for all non-immigrant visas are the same. This is from my personal experience in Nov 2005.
Step 1.
Make the two payments - either by DD or cash at the designated branch of HDFC bank. Take copy of passport along. Get receipt of the payment. There'll be a barcode sticker on the receipt which will also have the number which will be your receipt no. for all future references. This can be done by the individual applying for the visa or any representative but should carry the Passport copy of the individual travelling.
I had a brief a phone appointment with Mr. Khanna this morning. He was very friendly, understanding, and patient about hearing my situation regarding permanent residency. I found his advice to be excellent. Also, I found his team to be very responsive, efficient, and thoroughly professional.