Hi 
I am a beginner in cold fusion

1. Could you please tell me in which all cases i should restart the cf server. 
eg: Do I need to restart for any change in components?

2. I know vaguely that there are some restrictions for some tags used in 
CFScript. Kindly let me know what all should not be used. Can we use cfdump 
inside cfscript?
Are there any restrictions for CFfunctions too like that?

3. I see in one existing code in my application some lines like this? What is 
their meaning?

<cfif isDefined("arguments.url.action")> In this case I want to know what 
arguments.url.action means?

Sorry for asking such basic questions, have to as I am a beginner

Thanks






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