und in script geht das mit einer undokumentierten Sache so
Sub Click(Source As Button)
Dim ws As New NotesUIWorkspace
Dim varChoice As Variant
'Undocumented arguments for Prompt
'variant = notesUIWorkspace.Prompt( type%, title$, prompt$ [, default ] [, values ] )
'Type 13 is ChooseDatabase, remaining arguments ignored.
varChoice = ws.Prompt(13, "", "", "", "")
Msgbox varChoice(1)
'check in debugger for results
wobei
varChoice(0) = Server
varChoice(1) = Database
varChoice(2) = Datenbanktitel
End Sub