Hi,
Unfortunately PCIbex does not offer that function out of the box, so you will need to code it yourself if you want to implement it. There are two main directions you can go, considering that you are running the experiment on your own server: A. store the participant’s progress somewhere on the server and assign them a corresponding unique login ID, or B. generate an encrypted token when they leave that contains the progress information, so you don’t have to store anything on the server’s side
In either case, you would need to be able to restore the experiment the way you want it, including the order of the trials, which maybe you will have randomized, depending on your design. In addition, you might want to store the value of some variables, if you set those during runtime and future trials depend on them (eg. global Var elements)
In any case, this is not a trivial task, and I can only give you general pointers at this point
Jeremy