Thou Shalt Not Cross-Team

Jeff Hickman paid a visit to Camelot Herald to clarify what is acceptable in Dark Age of Camelot as far as cross-teaming goes:

Prohibited Conduct
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PLAYER MAY NOT USE THE DAoC SERVICES TO:

18. You may NOT cross-team spy. This means you are not allowed to have characters in different realms on the same server (usually used for the purpose of spying on opposing realms). This includes characters on different accounts. However, we will not discourage 2 realms from cooperating with each other against a 3rd (commonly referred to as cross-teaming), as long as you do not act against your home-realm. While we want all 3 realms to wage war against each other, there are times when a little cooperation is appropriate. “Cross-teaming” in this manner is not a violation of our rules.