This self-describing behavior is implemented by adding the following:

• _mbspresend() function to the MBSTRING typeswitch function list
• A protective file, $TUXDIR/udataobj/sendlen0_unsafe_tpmbenc, containing the names of the codeset encoding names which are considered unsafe to use with the feature.

The _mbspresend() addition requires any user who customizes Tuxedo buffers to rebuild their applications.