Wikipedia
EasyLanguage is a proprietary programming language that was developed by TradeStation and built into its trading platform. It is used to create custom indicators for financial charts and also to create algorithmic trading strategies for the markets. External DLL's can be referenced using EasyLanguage which greatly extends its functionality.
The language was intended to allow creation of custom trading strategies by traders without specialized computer training. Commands consist mostly of regular English words, which makes EasyLanguage easier to learn than more complex programming languages.
Example: "if the close is greater than the high of 1 day ago, then buy 100 shares at market" This is written in EasyLanguage as the following: "if the Close > the High of 1 day ago then Buy 100 shares next bar at market;"