need help on multiple direct tcpip channels

Hello!
Is libssh2 capable of creating mutiple direct tcpip channels on win32
platform?
Is it capable of connect to one host and forward port to another host,
i.e. -L<port>:<one host>:<port> <user>@<another host>?

I there's not so much open source software that uses libssh2 to
look for example. I found medusa, ksftpgrabber and perl/php bindings only.
Can you point to usable example or provide hint how to do it?

I guess channel init should be in blocking mode and
data transfer should be in non-blocking mode. And blocking is global
for all session. There's no example of proper
channel shutdown also. Help to figure how to use library. Please.

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