During callback registration, the associated cdf filename must be given to make HELP command retrieves automatically the description. The cdfFilename macro must be given on the second parameter of the evhCMD_KEY constructor.

   // Attach VALID command callback
    evhCMD_KEY validCmdKey(cmdVALID_CMD, cmdVALID_CDF_NAME);
    evhCMD_CALLBACK validCB(this, (evhCMD_CB_METHOD)&cmdReplaceByClassNameMANAGER::ValidCB);
    AddCallback(validCmdKey, ValidCB);

-- GerardZins - 13 Jul 2006