In QGIS it is possible (and it’s recommended) to define the project’s CRS (coordinate system).
For Austria MGI M31 use EPSG Code 31258. See screenshots attached.
Quantum GIS has the option to perform on-the-fly transformation between geodata with different coordinate systems within the data-frame.
When to use it ?
You have geodata referenced in different CRS (Coordinate reference systems) in one project (data frame).
Be aware !
Be aware that every data-layer has a coorect CRS defined and the CRS of the data-frame has to be defined !
Also keep attention whether the correct transformation (parameters!) ist performed.
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