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Hi Jamal,
According to the Help, it doesn't look like it uses the Mask environment variable.
Topo to Raster (Spatial Analyst)
If you look at the bottom under Environments, you will see that Mask is not listed.
Patrick.
p.s. To better direct questions dealing with Spatial Analyst tools, it is better to post in the Spatial Analyst forum, not the ArcGIS Desktop - General forum. Same goes for raster data, it is better to post in the Imagery and Raster forum and not the ArcGIS Desktop - General forum.
Jamal
Did you look into using the BOUNDARY parameter of TopoToRaster?
http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#/Topo_to_Raster/009z0000006s000000/
Steve
Jamal
Because the environment shows up does not mean that it is supported. Random numbers in the environment, for example, are not supported when you do CopyFeatures.
The tool's help lists which environments are supported.
Also, MASK is supported by nearly all the tools in the Spatial Analyst toolbox, all the Geostatistical Anlyst tools that output raster (but only from 10.1 onwards). The tools in the Conversion toolbox and the Raster tools in the DataManagement toolbox, for example, also do not support mask.
I hope this helps you better understand which tools support mask.
Steve