How to know if the stop price has been reached in StopLimit Orders

I believe a StopLimit order has 2 components

  • Stop price and
  • Limit price

I want to know if the stop price has been reached or not.

If it has, what elements of the orders has changed. E.g.

  • Can the StopLimit be modified and how? As this is not a limit order should I update the price? When accessing the order properties what change from before?
  • Can the TP be changes?
  • Can the SL be changed?
  • Are there restriction on what and when changes or cancellation of the order can be done?

Also what are the restrictions on StopLimit orders due to:

  • Stop Level restrictions
  • Freeze Level restrictions