I think of something like this

DO CASE
CASE cLanguage = "D"
cMsgText = "Beschreibung des Fehlers."
cMsgHeader = "Fehler"
CASE cLanguage = "E"
cMsgText = "Description of Error."
cMsgHeader = "Error"
ENDCASE

MESSAGEBOX(cMsgText, 0, cMsgHeader)


>>>>This is to give messages in a language depending on the user's language.
>
>What code does that?
>
>>I don't understand your "What do you use". Can you please explain?