Is it against the rules to post under multiple handles?

[JohnCrover]

The title says it al.

 

[gronbog]

It is on every site on which I've ever participated. The reason should be obvious.

 

[johndoe]

If it isn't it should be.

 

[LV Bear]

I'm not aware of a specific rule, but even if there was, there is no practical way to enforce it.