The Dictionary panel is a special help panel which contains information about standard functions, constants and variables. It displays a short comment about the function, variable or constant.
The Dictionary window is shown below.

As you can see, the Dictionary shows information for the four supported languages: ProTrader Language (native), MQL2, MQL4, EasyLanguage. Functions, Constants and Variables are displayed as tree nodes. Nodes are further divided into sub-nodes according to each usability package.

To expand all groups to show their subgroups, click the Expand All button. To collapse all groups showing their subgroups, click the Collapse All button.

Favorites includes user's favorite functions, constants and variables. If you want to add functions to favorites, select the function, constant, or variable name in the Dictionary and right-click to open the context menu and select Add to Favorites.

You can filter functions using advanced criteria of Dictionary panel.

Double-click on each item for html description. Here you can find function prototype, description, parameters explanation and example.