Hi Felix,
yes, I created this dummy script using the Windows client. This dummy script, does not refer to any object and is just used to test actions like SEND_UNI=SEV=I for example. It needs to be fired manually. In order to create such a dummy script using the Windows Client, you need to skip the "Source Object Selection" in the Automation Script Wizard.
These scripts reside as Members in your AUTOSCR library. It would actually be possible to manually create scripts using ISPF EDIT, but this is not recommended. You should always use the Windows Client to be sure the correct syntax is used.
Best regards
Achim.