You will only be allowed through the security checkpoint for the Gate Area from which you are departing. However, due to the configuration of the airport, it is possible to access either Gates 1-29 AND Gates 30-59, OR Gates 70-99 AND Gates 100-129 once you have passed through the security checkpoint for your gate.
Similarly on arrival, you may access either Gates 1-29 AND Gates 30-59, OR Gates 70-99 AND Gates 100-129 depending on the gate at which you arrive, by switching APMs (Automated People Movers [trains]) in the Main Terminal. If you wish to access the other Gate Area which is paired with yours, go directly to the other APM (train) as soon as you disembark the APM in the Main Terminal. Do not go past the security checkpoint and out into the Main Terminal otherwise you will NOT be allowed back through security to access the other Gate Area.