At present, the only way to get the full libg++ documentation, including IOstream (which is currently missing from the web version of the documentation), is as follows:
  1. 1st time round: add this line at the end of your .cshrc:
    setenv INFOPATH ${INFOPATH}:/vol/vssp/vap/soft/GNU/info:/vol/vssp/packages.sun4/GnuCompilers/info

    and open a new shell or xterm.

  2. Go into xemacs and type:

    <CTRL>H <CTRL>I libg++ <RET>

    This will take you into the emacs "info" hypertext system at the libg++ page.