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Safe I hope...you can never tell ...unless you write it yourself...
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... not necessarily.
If you're an Úbergeek, you could sniff your internet connection with a protocol analyzer (sniffer) and take a look at who is talking to who. It's pretty cool ... heh heh heh.
A small taste ... below is part of a TCP three way handshake
1 0.000.000 [x.x.x.107] [x.x.x.130] 74 TCP D=80 S=49424 SYN SEQ=516358212 LEN=0 WIN=65535
2 0.031.459 [x.x.x.130] [x.x.x.107] 74 TCP D=49424 S=80 SYN ACK=516358213 SEQ=799145663 LEN=0 WIN=64512
3 0.000.902 [x.x.x.107] [x.x.x.130] 66 TCP D=80 S=49424 ACK=799145664 WIN=65535