Specifies the name of the transaction program (TP) to be invoked when a session using this mode is deactivated or ended. If the name is NULL, no transaction program is invoked. When the TP name consists entirely of displayable EBCDIC code points, it is mapped directly to the equivalent ASCII display string. However, registered TP names always have a non- displayable EBCDIC code point (value less than or equal to x'3F') as the first character, so they cannot be directly mapped to an ASCII display string. These TP names are converted to a display string that is equivalent to a hexadecimal display of the EBCDIC code points. For example, the 2-byte TP name x'06F1' (CNOS) is converted to the 6-byte ASCII display string '06F1' (including the two single quotes).