Please disregard my previous message, I included wrong details.
This is what I actually do and cannot get GRASS commands to work from R
under Windows7. I try both from R with no GRASS session running and starting
R from within the GRASS shell console:

If I start R outside GRASS (and with GRASS not running):
> setwd("D:/1_MASTER_SIG/1-0_PROJECTE/CALCULS")
> require(rgdal)
Loading required package: rgdal
Loading required package: sp
Geospatial Data Abstraction Library extensions to R successfully loaded
Loaded GDAL runtime: GDAL 1.7.2, released 2010/04/23
Path to GDAL shared files: C:/Program Files/R/R-2.13.0/library/rgdal/gdal
Loaded PROJ.4 runtime: Rel. 4.7.1, 23 September 2009
Path to PROJ.4 shared files: C:/Program Files/R/R-2.13.0/library/rgdal/proj
> require(raster)
Loading required package: raster
raster version 1.8-39 (3-July-2011)
Warning message:
package 'raster' was built under R version 2.13.1
> require(spgrass6)
Loading required package: spgrass6
Loading required package: XML
GRASS GIS interface loaded with GRASS version: (GRASS not running)
Warning message:
package 'spgrass6' was built under R version 2.13.1
>  gmeta6()  #ara treballem des de r amb grass
Error in system(cmd0, intern = TRUE) : 'g.region.exe' not found
Error in parseGRASS(cmd) : g.region not found
> initGRASS(gisBase= "C:/Program Files (x86)/Quantum GIS
Wroclaw/apps/grass/grass-6.4.1/bin", home=tempdir(),
gisDbase="D:/GRASSDATA", location= "MNSY2", mapset="MNSYGRASS", override =
F, use_g.dirseps.exe = FALSE)
Error in system(cmd0, intern = TRUE) : 'g.region.exe' not found
In addition: Warning messages:
1: In dir.create(gisDbase) : 'D:\GRASSDATA' already exists
2: In dir.create(gisDbase) :
  cannot create dir 'D:\GRASSDATA', reason 'No error'
3: In dir.create(loc_path) : 'D:\GRASSDATA\MNSY2' already exists
4: In dir.create(loc_path) :
  cannot create dir 'D:\GRASSDATA\MNSY2', reason 'No error'
Error in parseGRASS(cmd) : g.region not found

If I start R from within the GRASS console (through the QGIS grass plugin):
(having navigated to my R working directory and started up R with
"C:\Program Files\R\R-2.13.0\bin\i386\Rgui.exe" ):
My R workspace is loaded normally,
Then I do:
> require(rgdal)
Loading required package: rgdal
Loading required package: sp
Geospatial Data Abstraction Library extensions to R successfully loaded
Loaded GDAL runtime: GDAL 1.7.2, released 2010/04/23
Path to GDAL shared files: C:/Program Files/R/R-2.13.0/library/rgdal/gdal
Loaded PROJ.4 runtime: Rel. 4.7.1, 23 September 2009
Path to PROJ.4 shared files: C:/Program Files/R/R-2.13.0/library/rgdal/proj
> require(raster)
Loading required package: raster
raster version 1.8-39 (3-July-2011)
Warning message:
package 'raster' was built under R version 2.13.1
> require(spgrass6)
Loading required package: spgrass6
Loading required package: XML
GRASS GIS interface loaded with GRASS version: GRASS 6.4.1 (2011)
and location: MNSY2
Warning message:
package 'spgrass6' was built under R version 2.13.1
> gmeta6()
gisdbase    D:/GRASSDATA
location    MNSY2
mapset      MNSYGRASS
rows        549
columns     1000
north       4636820
south       4613150
west        429462
east        472499
nsres       43.11475
ewres       43.037
projection  +proj=utm +no_defs +zone=31 +a=6378388 +rf=297
+towgs84=-87,-98,-121,0,0,0,0 +to_meter=1
>

which is correct. But then, when I try to run any GRASS command, I get an
error:
> system("g.region -p",intern=T)
Error in system("g.region -p", intern = T) : 'g.region' not found

I've tried with initGRASS(), but
> initGRASS(gisBase= "C:/Program Files (x86)/Quantum GIS
Wroclaw/apps/grass/grass-6.4.1/bin", home=tempdir(),
gisDbase="D:/GRASSDATA", location= "MNSY2", mapset="MNSYGRASS", override =
F, use_g.dirseps.exe = FALSE)
Error in initGRASS(gisBase = "C:/Program Files (x86)/Quantum GIS
Wroclaw/apps/grass/grass-6.4.1/bin",  :
  A GRASS location is already in use; to override, set override=TRUE

Any help on what am I doing wrong? Do I have to start R from within GRASS
under linux?

Thanks!

Cristina,
> sessionInfo()
R version 2.13.0 (2011-04-13)
Platform: i386-pc-mingw32/i386 (32-bit)

locale:
[1] LC_COLLATE=Spanish_Spain.1252  LC_CTYPE=Spanish_Spain.1252
 LC_MONETARY=Spanish_Spain.1252 LC_NUMERIC=C
LC_TIME=Spanish_Spain.1252

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base

other attached packages:
[1] spgrass6_0.6-27 XML_3.4-0.2     raster_1.8-39   rgdal_0.6-33
 sp_0.9-81

loaded via a namespace (and not attached):
[1] grid_2.13.0     lattice_0.19-23
>

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