In VLF-ONE all alphanumeric clipboard values support Unicode. There are no special Unicode parameters.
In VLF-WIN save Unicode values use the avSaveValue method as you normally would but pass Unicode values to the FromAValueU parameter:
#AvFrameworkManager.avSaveValue WithID1(PRIVATE) WithID2(*COMPONENT) WithID3(MyUnicodeString) FromAValueU(#UnicdeTxt)
Similarly when retrieving Unicode values:
#AvFrameworkManager.avRestoreValue WithID1(PRIVATE) WithID2(*COMPONENT) WithID3(MyUnicodeString) ToAValueU(#UnicdeTxt)