AT&T 6300 Programmer's Manual page 51

Getting Started
If you specify the R option all open data files
are kept open, thus you can re-use these files in
the new program without having to open them
again.
Before entering a RUN filename (or RUN
filename,R), save your current program (unless
you already have a copy).
GWBASIC statements are executed in line
number sequence, unless a control statement
(GOTO, ON GOTO, IF...GOTO...ELSE,
IF...THEN ELSE, FOR/NEXT,
WHILE/WEND) or a subroutine call
statement (GOSUB, ON...GOSUB) dictates
otherwise.
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