need small help with gl12.glDrawRangeElements(...)

in GL12.glDrawRangeElements(int mode, int start, int end, int count, int type, long indices_buffer_offset)
can someone please explain what every parameter specifies? im not sure i got it right and i couldn’t find any useful into in google/other.

Lets say i have an indices buffer (size 6 = 2 triangles X 3 vertices) and 6 interleaved vertices in my vertices array (V[3]N[3]C[4]T[2]) of float type.

what do i need to specify in glDrawRangeElements(…) to draw them all (its VBO based).