To Edgold:
Just to be sure we're talking about the same things here....
Judging from your post above, you're talking about the names of Channel Strips, in which case there is a folder called 10 Orchestral, sub-folder 10 Strings.
(If you look at the EXS24 Instruments directly, there is a folder called Factory, sub-folder 09 Orchestral, sub-folder 09 Strings, where you can select just the instruments themselves)
In the Channel Strips, everything called "Section" is exactly that - a particular section of the strings (eg Violas, Cellos etc). The largest instruments are just called Viola Section for example, and they contain several articulations. You can select the different articulations via the modwheel. (Logic uses modwheel often in this way)
The other choices are Viola Section Pizzicato for example, which only plays the Pizz articulation, but may have 2 velocity layers or more.
The "Ensemble" choices have all the sections mapped out over the keyboard, so that if you play low, you get basses and cellos and if you play high, you get violins.
Every single one of these instruments are sections consisting of several players. You can hear this clearly if you play using higher velocities (ie loud). There are no solo instruments at all. (There is an Irish fiddle in the European section of World - that's the one and only.)
If you choose the EXS24 instruments directly, the names are all the same, except they they say "Basses Legato" instead of "Bass Section Legato" as in the Channel strip list.