Double floats

[millett@sbctri.sbc.com]

I am tring to take a double-float number, break it down into 2 long
integers (high-word and low-word) to send over the network conforming to
the IEEE floating point standard.  I also want to read 2 words from the
stream and make a double-float from them.  Any Ideas?  Symbolics has two
functions that do what I want: "si:dfloat-components: (double)" &
"si:%make-double: (high low)"  Any way to do this with the mac?

Thanks,
millett@sbctri.sbc.com