[FreeNX-kNX] how to suspend a session (from the command-line)?

[Felipe Alfaro Solana]

> FreeNX 0.5 reputedly handles suspending sessions on disconnect much better
> than 0.4.x but I haven't tried it yet myself.

I must be either stupid or blind but have been unable to guess where
to download FreeNX 0.5 tarball. Any pointers, please? Thanks.