you have to create a bat/shell script on the server side webspeed who set/export all variables
like TERM,PATH,DLC,JAVA_HOME, etc ... and start
$DLC/bin/_progres -db [dadabase] -p yourExcelGeneration.p
and , in the webspeed page you start this script with OS-COMMAND SILENT VALUE("script.sh"), at the end of the page.