Each start cmd /c launches a second progam in a new window. This is a single batch file that can be run that runs FMP24, sleeps for 5 seconds, then launches DSD plus. If you populate the lines correctly, you can have a single batch file for whatever system you want to use, if you don't want to use the siteloader for what ever reason.
start cmd /c fmp24 -i"00001000" -o20001 -_2 -b9.5 -u0 -g36.4 -fyyyy.yyy
sleep 5
start cmd /c dsdplus -i20001 -f1 -o0 -PTmp3 -v0 -T -O NUL -- >> xxx-xxxx.txt