I can't understand how glubeginpolygon ecc works...pls is there someone that can write me the code with declerations ecc....i tried but i can't see the polygon...then i have a problem with glTessVertex(tess,v1,v1)

what means v1,v1???? is it a vector or what??
i put simple the coordinates of my poligon there like 100,100 but doesn't work!!!! help me!!
i need to see the code to understand how it works!!
thanks to everyone who writes it!! pls help me...i'm driving me crazy!