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how to set a global assumption setting Every Varaible I use is Real?


i'm dealing with simple trig funcions, Sin[], Cos[] and so on ...
'm also using Conjugate and my expressions are full of 
Cos[a]*
Now if a is real there's no risk to have Complex number.
I have may variables, and I would like to avoid a redefinition of
$Assuming where I have to list every varaible I use. I prefer, if
exists, somethig like:
"Dear Mathematica 5.1,
	every variable I use is Real, wathever its name is ...
If I'll need complex number I'll use :ii: to enter the imaginary unit.
See you at next calculation.
Regards
Your faithfull User."

Is it possible?


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