Comment on Basics on Options Shorting/Writing

sir,
I am little confused about option Margin requirement …
1. The margin required by SPAN calculator is the minimum margin that should always b kept in my account while writing option…?
Or
2. there is some trigger amt at which you will call the customer for additional amount to deposit…
Or
3. You will call after the margin is swept away to deposit additional amount for continuing..

and hope you Call your client to deposit additional amount before squaring off..??

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