How to use two substitute messages?

[clawton]

I would like to display two different messages at the end of different questionnaire files. Right now, I am using the following substitute text in one questionnaire file: 114,"Please call the researcher to continue!", executable instead of the default: 114,"Click the Continue button to proceed.", executable. However, in a later questionnaire file in the same experiment, I want to be able to use the default message. Thanks.

[jarvis24]

As far as I know, you can only substitute once and it will be for the whole session.