The environment is 9iAS on Solaris 2.8 with an 8.1.7 database.
The database has character set WE8ISO8859P1.
Umlauts (the two dots above certain vowels), are dropped when using a web application based on the PL/SQL web development kit.
Oracle Forms with the same userid and the same database doesn't change the data.
I think it is a client problem, but need a suggestion on how to set the NLS_LANG on a web client.