.COMPILE: Compile a program.
.CONTINUE: Continues execution of a stopped program.
.EDIT: Opens a file in the IDL Workbench editor.
.FULL_RESET_SESSION: Reset the session and unload sharable libraries.
.GO: Execute a previously-compiled $MAIN$ program.
.OUT: Continues execution until the current routine returns.
.RESET_SESSION: Reset the IDL state, delete all variables and clear compiled code.
.RETURN: Continue execution until RETURN statement.
.RNEW: Erases $MAIN$ program variables and then execute .RUN.
.RUN: Compile and execute IDL commands from a file or the keyboard.
.SKIP: Skip over the next statement or statements.
.STEP: Executes one or more statements.
.STEPOVER: Executes one or more statements but do not step into routines.
.TRACE: Continue execution, display each line of code as it is executed.