Server Log-file
a text file generated by the MT4 server that is used for recording all events related to customer trading and platform performance, including all dialogues between client terminals and dealers.
Session Gap
a price gap between the first quote of the current market session and the last quote of the previous market session.
Slippage
a parameter of Expert Advisor that sets-up the maximum difference between the requested price and the dealer’s price, that is acceptable to Expert Advisor for opening a position in the customer’s account; a difference between the order’s price and its actual price execution.
Spike or Data Error
an incorrect quote generated by the server because of a data feed error; commonly looks like a significant price gap returning close to the previous level on the next price update, with no signs of rapid market around; Our team has the discretion, but not the obligation, to remove such errors from its quotes database.