BlockSysParam is a sandbox setting in Sandboxie Ini. It specifies whether Sandboxie will allow sandboxed programs to change various system parameters.
. . . [DefaultBox] BlockSysParam=n
Specifying n indicates that a sandboxed program should be permitted to issue requests to change various system parameters, such as the desktop wallpaper.
For an extensive discussion about the system parameters that can be changed, please consult the discussion on the SystemParametersInfo API on the Microsoft MSDN web site.
Technical Note: When Sandboxie blocks a request to change a system parameter, this is logged in the Resource Access Monitor as operation (SystemParametersInfo:nnnnnnnn) where nnnnnnnn is a hexadecimal value corresponding to the uiAction parameter passed to the SystemParametersInfo API.
Related Sandboxie Control setting: Sandbox Settings > Restrictions > Low-Level Access
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