[GRASS5] purpose of grass

[dev aki]

Hi,
Can GRASS API be used to interact with GIS which
stores the data in all the vector formats like DXf and
all the Raster formats.

can it be useful for my task like find all the places 
within 2 km like that provided my position is given to
it.
Is GRASS is a java based API.
Can any body enligt me on these issue and about GRASS
like what purpose it is specically meant for
regards devaki

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