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The Tcl language has the exec command used to invoke a subprocess. This command treats its arguments as the specification of one or more subprocesses to execute. It is possible to invoke a subprocess from GiD using this option.
Example: invoking a process in the background
exec netscape http://www.gidhome.com &
Note: In Windows, instead of & it is necessary to put >& NUL: & to run the process in the background.
Example:
exec PROGRAM_NAME >& NUL: &