Unicode arguments in posstr(), locate() and LIKE

I'm wondering if it is possible to supply Unicode arguments to the functions
posstr() and locate() and to the LIKE predicate? If yes, could someone write
a simple example or two showing the syntax?

I'd like to be able to search a given CHAR() or VARCHAR() column for single
or concatenated Unicode strings. For example, if I want to find a tab,
followed by a accented letter like the French a grave, followed by a space,
in a CHAR() column via posstr(), locate() or LIKE, expressing the characters
in Unicode, how would I write the query?

Also, what codepage would the database need to be for this to work? And what
versions of DB2 on Windows would I need as a minimum to obtain this
functionality?

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Rhino