Moving to XEmacs

Hi,

I've been using XEmacs for some time now (after using vim for about 5
years),
I really like it, but there a few things which I used to do in vim but I
don't
know how to do them in XEmacs (although I'm sure it's possible),
These are my problems:

1. Customized Syntax Highlighting:
    In vim I've created a syntax called "dtxt", when I run "set
syntax=dtxt",
    it sets up my customized syntax highlighting (I've attached an example
    to this email: syntax.gif)
    I've looked everywhere I could, and I couldn't find a simple example
    that shows how to do this.

2. Encrypted Files
    In vim I can run ":X" and it will encrypt the file with a password of my
    choice, and the file gets encrypted (including the swap file and backup
file),
    when I open it, vim asks for my password, and decrypts it (although the
    file is still encrypted when I save it).

3. Autocompletion like Visual C++
    Is it possible to have autocompletion like Visual C++'s, or anything
    close to it?

Thanks in advance,
and Best Regards,
    David E.
    [email protected]