Ship dispositions

I have a spreadsheet which lists all the ship class dispositions from 
FB1.  The numbers show "dangerous ships" to be on as well as popular 
export models.	Not being a naval type I'd like to know what 
Decommissioned and Reserve actually mean in the context of FT.

When a ship is decommissioned is it sold off as scrap?	Or to another 
power (corporate, small nation, etc)?

When a ship is placed in reserve is it a combination of moving it to 
training status or mothballing it around a station or a lagrange point?

About vessels sold -- can I assume these sales are to friendly nations. 
  Or do these sales include private concerns as well?

Damo