Arrow Signals into EA with Alernating Buy and Sell Orders

Hi All

I am a newbie so bear with me.

I am using an indicator which plots arrows for when to buy or sell.

I have put together an EA which is intended to always be in the market but I have two questions.

1. How do you call the arrow signals from the indicator. Basically I need to know when an arrow is plotted to open an order. The indicator uses 2 buffers, one for buy and one for sell and I can call their values with icustom() but I need to know the exact time when the arrow signal posts so as to open a new order.

2. When the signal arrow is given how do you immediately close the open order and reverse to the opposite position.


Thanks in advance for your help!