Call Ghostscript in Windows by its invocation name?

There are several possibilities. To list the two most frequent ones:

1. c:\full\path\to\gswin32c.exe should always work. For 64bit systems, use c:\full\path\to\gswin64c.exe.
2. After a fresh installation using a standard windows installer, you may need to reboot before the updated %path% environment variable is used.
3. Open a cmd window and (assuming your Ghostscript installation ended up in c:\path\to\gs...) then type set path=c:\path\to\gs\gs9.02\bin;%path%. From this same cmd window you can now simply use gswin32c to start Ghostscript (use gswin64c on 64 bit Windows)...

I've finaly got what i want after rebooting. Weird. Thanks all of you for your help.