Leginon

As long as the submission of the new batch of targets for processing is to the acquisition node that is currently processing its submitted queue, you will be fine. Exposure node will search in the database for all queued targets submitted to it, and process them in order. It does this every time after it finishes a target.

Therefore, in your case, if I understand right, let's say you

1. Submit 10 queued targets (with the Q tool) to Exposure.
2. Pause Exposure Node when it is about to acquire 5th targets inside that queue.
3. Acquire more hl images, pick a total 20 targets on them, and put them in the queue (with the green "play" arrow tool that says "Submit Target").
4. Once scope is idle again, you submit these 20 queued targets to Exposure with the Q tool.
5. Unpause Exposure Node

The result: It will first finish the 6 targets left from (2) and then process the 20 targets from (3,4). Yes, it means that they are appended to the older ones.

Thanks Anchi. That is exactly what I did and the results I got. When are the second set of queued targets actually submitted, when I click the triangle submit target or when I click submit queued targets? I did both but the submit queued target button did not generate anything in the log window and yet they seem to have been processed.
Bob

Looks like I should add more log message : )