Hidding Query Strings

Is it possible to hide a quey string ie. ?AccountId=12 when passing this to a CGI, so that a user cannot change the AccountId to another value.
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fasterConnect With a Mentor Commented:
Query string can not be hidden, but you can make it more difficult for a user to change it.  One way is to use POST method, another is to set this in a hidden field.  Or you can consider to use cookie.
Well, there's
<input type=hidden name=AccountId value=12>
but that doesn't really prevent the user from creating another
page with a different value.
Although it's hard to hide the actual query strings, you may be able to hide its other valid values
If you use a one-way hash on the value, you could make it very hard for a user to guess what values it would make sense to change it to.
I came up with the same question, you can see alamo's answer at the "JavaScript Topic Area" titled "Hiding the Location string from the user".

So far now I think the best approach is a combination of faster's answer and ozo's comment... but if you get a better clue, please leave me a comment... ok??

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