Afaik, What vsangeeth has tried to explain is that if you want margin money on your shares then you can get margin worth only 350 rs only.
The value of your shares is 2350.
>I do not do anything on the ShareKhan site for long periods. Is it possible that
one day I might not only have lost my entire starting money (= 5,000/- that I
gave when opening the S'Khan accounts), but even become liable to pay some
thing more (to ShareKhan's or some other Bodies) ?
To lose money also, you need to make some efforts. so dont worry. just take care of your fixed and variable brokerage charges and account maintenance charges and charges under 'others' category.
>Can a completely ignorant and careless person loose more than his starting money ?
Yes, he can. Usu, you need to show only 5% margin for buying futures i.e. only 5 rs if you are purchasing worth 100 rs. so, if your loss is 50 rs, then you have to pay 45 rs more.
Cheers.!