From the wiki:
Quote:
Plugin_Continue - The original server command will be processed, if there was one. If the server command was created by a plugin, this has no effect.
Plugin_Handled - The original server command will not be processed, if there was one. If the server command was created by a plugin, this has no effect.
Plugin_Stop - The original server command will not be processed, if there was one. Additionally, no further hooks will be called for this command until it is fired again.
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Most often you will use Plugin_Continue and Plugin_Handled. Plugin_Stop is used for things like stopping a repeating timer, etc.