In debug mode:

The top line of the screen is used to display the current line in the script starting at the current statement. Optionally, the second line of the screen is used to display the value of a specific variable or macro.

The following keys are available to control script execution:

Key	Action / Description
F5	Run (deactivates debug mode, runs rest of script to the end or until a DEBUG ON command is encountered).
F8, [Space], [Enter]	Step into (run a single statement, follow thread into subroutines, UDF’s, and secondary scripts).
F10	Step over (run a single statement, executes, but skips over subroutines, UDF’s, and secondary scripts as far as the debugger is concerned).
\	(Backslash) Enables you to query the value of a variable, array element or macro simply by typing the name and pressing [Enter]. Similarly, you can execute an arbitrary piece of KiXtart code simply by typing it in and pressing [Enter].
Q, [Esc]	Terminate script execution and exit KiXtart.