Multiple process access to data stream

Hi,
I wrote a code to access a stream of data coming in from an ethernet port. Everything works fine until I try to open multiple applications trying to access that same data: after the first process is open, any additional ones just won't run, all I get is a dos screen that just sits still and does nothing. Can anyone please just point me in the right direction as to how bypass this limitation?
I already tried saving the data to a temporary buffer and having all the processes access that buffer and I got the same result.

This depends on how you are accessing the temporary buffer. Writing to a disk? Shared memory? What?