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## sendsys, version, and senduuname

Finally, there are three messages that may be used to find out about the network's topology. These are sendsys, version, and senduuname. They cause C-News to return to the sender the sys file, a software version string, and the output of uuname(1), respectively. C-News is very laconic about version messages; it returns a simple, unadorned ``C''.

Again, you should never issue such a message, unless you have made sure that it cannot leave a your (regional) network. Replies to sendsys messages can quickly bring down a UUCP network.