How do you make a saddle type solid?

 From:  Frenchy Pilou (PILOU)
4400.2 In reply to 4400.1 
One method
Join each curve : it's the secret ;)
draw a line face to face
draw a line back to back
Trim curves by these 2 lines
Network will now working ;)
Ps Of course you can draw curves against lines ;)

EDITED: 26 Jul 2011 by PILOU