AT&T 6300 Programmer's Manual page 56

Getting Started
2-38
You can modify the line, and then rerun the
program by entering RUN. You cannot
continue execution by entering CONT.
If you want to examine the contents of some
variables before making any modifications
you should press CTRL BREAK to return to
Command Level. After examining the
contents of the variables you can edit the line
and rerun the program.
For example:
10
A=2S~
RUN
?Syntax Error in 10
10 A=2S&
If an error (other than a Syntax error) is found
(automatic interrupt), the program is
interrupted, GWBASIC displays the error
message, enters Command Level and displays
OK.
You can either display program variables or
display program lines by an EDIT or LIST
command, and then modify them.
You cannot continue execution by entering a
CaNT command, but you can rerun the
program by entering RUN.