REM - mkilgore/QB64pe GitHub Wiki

REM or an apostrophe is used for programmer remarks, comments or to stop the execution of program code.

REM program comment or ignore code

• Comments cannot be read by QBasic correctly and may cause syntax and other errors without REM!
• Instead of REM you can use the REM symbol which can be put anywhere.
• Code can also be commented out for program testing purposes.
• QBasic Metacommands such as $DYNAMIC and $INCLUDE require the use of REM or the apostrophe.

 '' ''
REM This is a remark...
' This is also a remark...
IF...THEN a = 0 THEN REM (REM follows syntax rules)
IF...THEN a = 0 THEN '(apostrophe doesn't follow syntax rules, so use END IF after this)
END IF '' ''

• Apostrophe
• $DYNAMIC, $STATIC, $INCLUDE