There is one step you need to perform before you code your editor application to include any ToolTalk functions: you need to write a media load pattern callback routine. For example,
Tt_message CoEditor::loadISOLatin1_( Tt_message msg, void *pWidget, Ttttk_op op, Tt_status diagnosis, unsigned char *contents, int len, char *file, char *docname )
This callback is passed to the media load function at runtime.