Hi Marieke,

Usage of the function tsf_send_message will only show a particular message in the GUI but it cannot know what answer is given. I've explained it here in more detail: 

Message options can be used when using Process flows. Every Message option can have its own ‘Next step’. In the Process procedure of Show message you can decide which path to continue on the basis of the value of Statuscode (User selects an option, this results in a Statuscode value)

Let's say you make a Process flow that start upon Executing a table task, then after executing, it shows a Message (with option), selecting 'Yes’ then Open a document, if 'No’ then Stop the flow.

Example:

Thanks. That is clear