Note that the index numbers are only technical numbers which have no persistence. After a new system generation is done, all of them are invalid. To generate a persistent link, use the name.Use the URL:
http://ww-person.com/cgi-bin/l3/LANG=germ/F=Weriand@Alois@Leopold@Ulrich@Johann@Paul@Eremita/N=zu@Windisch-Graetz
Weriand Alois Leopold Ulrich Johann Paul Eremita zu Windisch-Graetz
alternatively: /cgi-bin/llmult/LANG=germ/P=44001887
Weriand Alois Leopold Ulrich Johann Paul Eremita zu Windisch-Graetz