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Close Order Function Confusion

Not necessarily a troubleshooting topic but how come with the MQL4 language there is the stigma of including slippage in the CloseOrder function ? I don't think slippage is a factor when I manually Close an order so why do you suppose slippage is absolutely necessary for an automated program? All it

Higher Timeframe's Highest Values Lower than Than the Smaller Timeframe's Highest?

I have been coding and realized that at some points the Highest High of the time periods fluctuate in interesting manners. To make my question more understandable: double d1highest = High[ iHighest ( _Symbol , PERIOD_D1 , MODE_HIGH , PERIOD_D1 , 0 )], //The Highest Point that the price has reached