[texhax] Question about commandchras in fancyvrb.sty

[Wataru Shito]

Hello, I am trying to set the command characters for Verbatim
environment in fancyverb.sty as;

  \DefineVerbatimEnvironment{MySplus}{Verbatim}{commandchars=@``}

so I can change the style of S-Plus code partially like;

  \begin{MySplus}
     @textsl` sl style splus code here ` 
     tt style splus code here
  \end{MySplus}

since the S-Plus code I would like to put in Verbatim environment uses
various type of characters except @ and back-tick.

Could anyone tell me how to enable the back-tick as a command
character?

Thank you, in advance.

Wataru Shito (Room 430)
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