Usage of a codepage that is released on an application server. In Unicode systems, the system codepage is always UTF-16 with platform-dependent byte sequence. In Non-Unicode-Systems, the system codepages are defined in database table TCPDB. In Non-Unicode- Single-Codepage-Systems there is only one system codepage. In MDMPsystems there are several system codepages. The codepage of the text environment of an internal session is always a system codepage. The system codepage of the current text environment is the active system codepage of an internal session.