How to stop and start System flows

In indicium-Universal there is the possibility to run System-flows in the background
Sometimes these System flows will run for sometime, (minutes or longer).
If we need to stop the system (par example for deployments), I have to be sure there is no System-flow running. Therefor I need the following functions:

1.    A way to tell Indicum-universal not to start new tasks
Is the way to achieve this to run the task: ‘Disable schedule’ ?
http://acto-D-upgradetest-EVO.acto.nl/indicium/api/20/disable_schedule 
Input Parameters: 
 {
  "project_id": "EVO",
  "project_vrs_id": "7.05",
  "gui_appl_id": 26,
  "process_flow_id": "create_iam_user"
}

2.    A way to find out whether there is still a task running.
Can you tell me how to do this?

3.    A way to tell Indicum-universal to start new tasks
Is the way to achieve this to run the task: ‘reset_system_flow_schedule’ ?
http://acto-D-upgradetest-EVO.acto.nl/indicium/api/20/reset_system_flow_schedule 
Input Parameters: 
 {
  "project_id": "EVO",
  "project_vrs_id": "7.05",
  "gui_appl_id": 26,
  "process_flow_id": "process_import_financial_data"
}