Type ASCII codes for uncommon characters ?

[sub-lyx-users-return-3855-archive=jab . org]

Hi !

I want to know if it is (or would be) possible to use direct ascii-code
to enter no-common characters, like a great "�" or an German esszet "B".
Under Windows, it is possible : we just have to type "Alt+225" for the
German character...

What about this ability under LyX ?