Intraweb DataModule multi users

Today after I deployed my Intraweb application, global variables that has been declared in public section of DataModule is shared. When user 1 modified a variable, user 2 will get this new modifications. Then I removed these variables to UserSession and it works fine. But I get the same problem with tables, I put a lot of tables, queries and StoredProcs in DataModule.
I noticed that when two concurrent queries has been called for the same database component I get some times error like "can not perform this operation in a closed dataset"
Does any one encounter such problem, and what is the solution

I use MultiThread in ServerControl's ComInitialization property
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MotazAsked:
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MotazAuthor Commented:
I found the solution. I shouldn't use DataModule in Intraweb.
Instead I copied all the data sets to UserSession module. It do the
same function as DataModule and each user has it's own UserSession object

Thanks
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