VertexTexCoords

Blitz3D Forums/Blitz3D Programming/VertexTexCoords

I've seen this:

VertexTexCoords surface,index,u#,v#[,w#][,coord_set]
Parameters
surface - surface handle
index - index of vertex
u# - u# coordinate of vertex
v# - v# coordinate of vertex
w# (optional) - w# coordinate of vertex
coord_set (optional) - co_oord set. Should be set to 0 or 1.

coord_set ?? does this mean we can have two UV coords per vertex? if so, how do we set this, and how to use?