----WARNING---- Unless portal has been fixed in the most recent update, the following holds true.
When you have multiple portal outs, but only one portal in, spark will behave in an undeceive manner. When the portal in receives a spark, not all portal outs will make a spark appear. Only if continuous spark is sent through a portal in will multiple portal outs receive a spark.
There remains a few other random glitches when combining portals and electronics. One is that portal will sometimes eat the spark before it can turn off a switch (if you have the follow setup - SWTCH, METL, NSCN, PORTAL IN). Please note, something like this will not work if the portal is pointing up, but if reversed, will work fine. This is due to particle numbering issues.
@Racer-Delux OMG. You jsut gave me an awesome idea. Heh. @Dwotci You can already get 1 way wifi. Just put METL WIFI then for the exit put WIFI P/NSCN. The spark can only be recieved by the P/NSCN so... One way wifi.
--Off topic-- @cctvdude99 Oh no..... RUN cctvdude99 is going to take over the PT virtual world!!! Good luck making portal behave =P.
--On Topic-- I would suggest doing what cctvdude99 said. It will save you headaches. You have no idea how confused I was when cracker told me to just turn my logic gate system upside down and it worked.... (well I am not confused anymore - as I know the logic behind it)