# Resolving z-order issues

If you encounter an issue related to z-order in applications published with Parallels RAS, you can try doing the following:

1. Open the Windows Registry on the computer where Parallels Client is installed.
2. Create a value named `ZOrderMode` with the type `DWORD` in the `HKEY_CURRENT_USER\Software\Parallels\AppServerClient\<guid>` key, where `<guid>` is the ID of the Farm.
3. Specify one of the following values:
   * `1`: Simple window manager rendering, no window clipping support. Works best with rectangular window areas.
   * `2`: Simple window-to-window copying with a fixed refresh rate, supports window clipping. Supports all window area shapes.
   * `3`: Heuristic mode, which switches between modes `1` and `2`.
   * `4`: Improved heuristic mode, which can require more resources.


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