[adpaturi]

Hi Venkatesh,

1. National Identification number in DS -156 form should be left blank
2.You can do it either way-- you can manually type it or you can use PDF to fill in the form and print it out and sign it
3.To avoid any discrepancies or delays, i would advice you to have the same signature in both of them
4. I am not sure abt it but as far as i know, if you are appearing for a visa interview at any US consulate in India, then it would be handy. But, if you are already here and want to get it stamped in Canada or Mexico, then they wouldn\'t ask for the photos of your company.

Hope this helps a bit,
Aditya