After reinstalling therion on several computers several times, I agree, that installation process should be easier (without setting environment variables). It means doing following things: 1. Therion should automatically search for other executable files it is using, if it can not find them with default settings. This is not very difficult task, and would work on 90% of all computers, because we can assume, that thpdf and theps2pdf are located where therion.exe is. Perl and TeX usually works from command line on UNIX, on Win32, there are may be five common installations . . . 2. The THERION environment variable could be ignored, if we will assume some default location for therion library (e.g. /usr/share/therion or C:\Program files\therion\lib). As far as I know, on Linux is standard /usr/share or /usr/local/share. Which would be better? 3. The TeX's (MPINPUTS and TEXINPUTS) could be probably written somehow to tex and mp file. I can write instead "input therion.tex" filename with the path "input /usr/local/share/therion/lib/tex/therion.tex". Than no TEXINPUTS is needed. Probably the same can be somehow done with MPOST. Do you have any other ideas? S.