LA> I understand that Warp 3 _blue_ spine (with WinOS2 inside) can be
 LA> installed on HPFS, but I still don't understand the same for the
 LA> _red_ spine version. 

Each OS/2 version since OS/2 1.3 (the first with HPFS) can be installed on
each HPFS formatted drive - so long as the whole drive is under track 1024
(the BIOS limit).

 LA> I think that Warp _red_ spine has to be installed _after_ DOS and
 LA> Win3.1x, on the same primary partition, so this partition has to
 LA> be FAT16 formated. 

Noways. It can (optionally) integrate the pre installed Win 3.1x - but
independant of the drive it is installed itself.

 LA> Then, the user could choose to never use Dual Boot anymore and
 LA> run anything (hum!) from OS/2.  

Nowhere! Dual boot is NOT designed for an productive environment. You my use
it to test OS/2 but not more.

 LA> Where am I wrong? Is it possible to install Win3.1x _after_ Warp
 LA> 3 red spine on an HPFS partition? Or use another trick?

You my install Win3.x under DOS on drive C: (FAT) - and you can have installed 
OS/2 on drive g: (HPFS). If you don't have already Win support installed you
can do so by starting the installation program and integrate it then.

It would be quite simper to install DOS/Win first and then install OS/2 on its 
own drive because OS/2 will dedekt the pre installed windows and ask you to
integrate that.

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