Function GetOpenStatus(link: integer): integer;
Returns the status of the specified link for the current mode:
0: Two-way street
512: One-way street, which may only be travelled in the digitised direction.
1024: One-way street, which may only be travelled in the reverse of the digitised direction.
1536: Closed street.
See also CloseLink
Possible error codes: -10 -30
ActiveX / VCL / CLX component: RWnetBase