Auto Trading options Difference and Changes

 

I found some auto trading options on meta trader 4.

It has each other names. 

 

1. Toolbar

: AutoTrading (button)

2. Expert Advisors tab in Options menu

: Allow automated trading (checkbox)

3. Common tab on Chart Expert Advisors properties (on popup menu when mouse right click in chart)

: Allow live trading (checkbox) of Live Trading Groupbox

 

What difference is it ?

EA attached has smile mark on the top-right in chart. Sometimes, Often, it has changed grimace mark.

When, Why does this mark change in any condition ?


I've confused.  No detailed manual in Meta Trader 4.

Please let me know.

 

Thanks, 

Reason: