OSTC Tools support

[Willem Ferguson]

When we say Subsurface supports OSTC Tools, what exactly does this mean? 
Is OTC Tools the regular download
software for OSTC? I see its divided into 3 parts with separate 
functions, some of it overlapping with Subsurface.

I am trying to figure out what should go into the user manual with 
respect to this topic.

Currently the only vaguely relevant text is in section 11 of the manual 
(Configuring your dive computer).

Is there anyone with an OSTC who can help?
Kind regards,
willem