Hi, thanks to all for the exhaustive replies. >Are you sure? AFAICT, etc/lock should always succeed on Windows, i.e. >it won't stop you from having two sessions with the same current >mapset. You will get a warning, but the mapset should still be >changed. sorry but not. I tried to find out why here http://trac.osgeo.org/grass/browser/grass/branches/develbranch_6/general/g.mapset/main.c but I still don't know many things in GRASS code to understand it well (and my C is very very rusty). I just found that at lines 155-156 a conditional calls G_fatal_error if the GIS_LOCK env var is not set (var retrieved at line 154). >If g.mapset doesn't work, you can always change the GISDBASE, >LOCATION_NAME and MAPSET variables directly with g.gisenv. Yes, it doesn't produce errors, but it doesn't change the location/mapset! Marco
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