Jonathan Scott wrote:

> If you want to modify DC, you need to define an opcode which
> refers to the original DC first so that you can invoke it from
> within the macro.

> DC_      OPSYN DC      Set up alias for original DC
> DC       OPSYN MYDC    Redirect DC to my macro

> Then within the macro you can use
>          DC_   &whatever   Issue real DC

But John Ehrman's method is neater, as it doesn't require a
special OPSYN from the outside.

Some one could directly call MYDC, or use OPSYN, either
way it would work.

I have never used OPSYN, but I have written postscript programs
that redefined the \def operator.

Now, what happens if OPSYN is OPSYNed?

-- glen

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