* [[$INCLUDE]] can be used at the beginning or at the end of program SUB procedures.
* [[$CHECKING]]:OFF should only be used with '''errorless''' code where every CPU cycle counts! Use '''ON''' to re-enable event checking. Event checking can be turned OFF or ON throughout a program.
* [[$CONSOLE]] creates a console window which can be turned off later with [[_CONSOLE]] OFF.
* [[$RESIZE]]:ON allows a user to resize the program window. OFF is default.
* [[$SCREENHIDE]] hides the QB64 program window throughout the program until [[$SCREENSHOW]] is used.
* [[$IF]]...[[$END IF]] allows selective inclusion of code in the final program.
* [[$ERROR]] MESSAGE causes a compilation error whenever QB64 attempts to compile it, displaying MESSAGE to the user. This is useful if inside a $IF block, as the error can be conditional.