Classic Trailing => Use Stop Loss to Trail and it does reflect in your broker server
Virtual Trailing => Does not Trail using Stop Loss and it does not reflect in your broker server.
Trailing Gap = A Gap from Bid/Ask Price
Trailing Start = Distance from Order Entry Price (Order Open Price) to start trailing
Virtual Trailing => Does not Trail using Stop Loss and it does not reflect in your broker server.
Trailing Gap = A Gap from Bid/Ask Price
Trailing Start = Distance from Order Entry Price (Order Open Price) to start trailing