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## Connecting to a running simulation

Figure 5

VisIt currently treats simulations as though they were ordinary files. When the VisIt simulation interface library is enabled in your application, it writes a special file with a .sim1 extension to the .visit/simulations directory in your home directory. Each .sim1 file encodes the time and date it was created into the file name so you can distinguish between multiple simulations that VisIt can potentially open. A .sim1 file contains information that VisIt needs in order to connect via sockets to your simulation. If you want to connect to a simulation, you must select the .sim1 files corrsponding to the simulations to which you want to connect and add them to the Selected files list (figure). Once you've done that, connecting to a simulation is the same as opening any other disk file.