open a already running process

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http://unix.stackexchange.com – I have 64-bit RHEL 2.6.18-238.el5 running. I access the machine through vpn. I started an application via terminal and while application was running there was disconnection in vpn which closed my terminal. Upon reconnecting to vpn when I opened the terminal I could see that my application is still running ,checked using ps -ef command. Now how can I continue using my application in the terminal. Is there any way to access that running application in the terminal? Please help.Thanks (HowTos)