LinkLaunch["prog"] starts the external program prog and opens a MathLink connection to it.
LinkLaunch["prog"] runs prog as a subsidiary or child process to your current Mathematica session.
You can use a command such as LinkLaunch["math -mathlink"] to launch a subsidiary Mathematica kernel process from within your Mathematica session.
On most computer systems calling LinkLaunch["prog"] multiple times with the same argument will start several prog processes running. On systems such as the Macintosh, however, only one program with any particular name can be running at the same time.
On some computer systems, LinkLaunch[ ] will bring up a program browser.
LinkLaunch returns a LinkObject.
The option LinkProtocol specifies the underlying data transport protocol to use.
LinkLaunch internally calls a function analogous to the MLOpenArgv() function in the MathLink library.
See The Mathematica Book: Section 2.12.7.
See also: Install, LinkCreate, LinkConnect, LinkClose.
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