Ok it seems that I have not made my goal clear.
Here is what I am doing.   I have taken  an amature radio receiver and
connected a DTMF device.  From the 4 bits of information from the DTMF chip I
feed this into a pic 16c84.   The Pic packets the info and sends it over two
short range (ie radio's use to unlock car doors) radio's.  A pic on the other
end gets the information from the radio and checks the packet.
The information is then stored in buffer.

What I want to do is to check to see if a certain string if number was  sent
over that link.

Say if I send the group 1234 and actions happens.
But if I send the group 1479 the actions does not happen.

Can anyone give me any suggestions on how I might check this string and
determine if it is the correct one.

Jason