Passing Variable from Backend to Frontend

Hello oxid-esales-Community,

i am trying to create an Oxid Module, which contains a backend-site where a user could type a text in a formular - and with the click on a "submit" Button this Text will be shown in the sourcecode of every page in the frontend. I already read a few tutorials, so i know how to register my new module and how to set the basics. But i could not find any references by passing variables from the backend to the frontend (and saving them of course...)

So, summarized:
Im trying to pass a user defined variable (input by html-form) from the backend to the frontend, where it simply should be "echoed" :)

I hope you have some interesing and good links or documentation for me (i already tried the forum- and googlesearch)

thanks!