sql server 2005 revoke guest account on master

It doesn't allow me to revoke guest account on master.  Why is that?

This is what I use to attempt to do this:

use master
revoke connect from guest

I get this error:
Msg 15182, Level 16, State 1, Line 1
Cannot disable access to the guest user in master or tempdb.
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
as the error message indicates, you cannot do that.

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newbiealAuthor Commented:
Could have used some more explanation as to why this can't be done on the master db.
Guy Hengel [angelIII / a3]Billing EngineerCommented:
<Grading Comments:
Could have used some more explanation as to why this can't be done on the master db.

sorry, but I am not "Microsoft". I can only "guess" why, ie that every login must have access to the master database, as that one stores the login information so you can actually fully connect...
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Microsoft SQL Server

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