References to comments are the only object types that are of type string. Only INPUT comments or YES/NO comments can be referred to via references. These comment types have an ID that you can use to identify the comment.
Format: <Comment ID>.INPUT -> C1.INPUT
C1.INPUT - The input value (from the operator) for comment C1
YES/NO comment types set the input to the appropriate yes or no string based on the current language of PC-DMIS. In the English version of PC-DMIS, if the operator presses the yes button, the string is set to "YES". If the operator presses the no button, the string is set to "NO". When comparing strings to test for "YES" or "NO", the comparison is case sensitive. Thus, comparing against "yes" or "no" always fails even if the YES/NO comment input is set to "YES" or "NO".