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Wimp applications should work at all screen resolutions and colour depths that the Wimp allows and should not set a particular screen mode upon loading.
To obtain details about the current screen mode, use OS_ReadVduVariables and use the returned values within the application.
The Wimp issues Message_ModeChange to which applications should respond so that any mode specific data can be changed.
The Wimp provides access to the current screen mode and also useful colour translations and scaling operations.
Notes:
RISC OS has many guidelines on the mode independence. For a complete detailed guide, please see the RISC OS Style Guide.