beginner: text region polyline point from MapInfo

[Julien Buratto]

I've converted all my TAB files from MapInfo to a ESRI Shape file and,
for each TAB file, I got 4 sub-file:

_text.
_polyline.
_region.
_point.

For eachone MapInfo generated .dbf, .prj .shp and .shx files.

I was able to recompose the image using ogrtindex and then tiling,
that is making and index with all the *_region.shp files.

What I'd like to understand, is what exacly those 4 files rappresents.
For example, does the _text rappresent the name of things inside the map ?

Thanks
J

PS: Thanks to all that yesterday gave me so great suggestions! I had
really appreciated the idea of tiling layers and the right way to get
the EXTENT value!