at commands

we give commands In modems properties\extrasettings  like AT,ATX,at0,fx etc .why we give and please tell me all commands that are given at extrasettings?
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The reason commands are placed in the extra settings area is to either get the modem working a specific way or to get it working better when connecting to a remote modem setup or ISP.

As for what all commands can go in there.... This is modem chipset dependant.  I have on my website a list of the most common general commands used as well as links to modem chipset specific AT Commandsets you could look at.  You just need to identify what modem chipset you're dealing with first so you know which one to look at.

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