Sorry in advance, I’ve never used this action and I don’t know about ASP.
The “Submit variables” action should send all variables from the course to the URL given in the Adress field, i.e. the URL of the server script. The script then needs to pick the relevant variables from the full amount of data.
You might use a form with a “Submit form” action to reduce the number of variables sent along with those you need. You can decide whether to “POST” or “GET” the data to know where to find them in the server script.
Most of it should depend on what you want to do with the values. If you just want to remember which bookmark indicators should be red, it could also be done with a normal Lectora variable “retained between sessions”. In the end this would also store the information in the LMS’s database. You could then turn all indicators red when the course is reopened.