From ComputerCraft Wiki
|Added by ComputerCraft 1.6, runs program with as many specified arguments as are provided, in a new tab (and returns the ID number of that new tab). As access to the Multishell API is a requirement, this command is only available to advanced systems.|
Essentially takes all parameters passed to it and runs them as one line - for eg, shell.openTab("edit","myScript") is the same as shell.openTab("edit myScript"), and you can use whichever syntax happens to suit you.
|Syntax||shell.openTab(string program [, string args1, string args2, ...])|
|Runs the program "falling" in a new tab, and switches to it with shell.switchTab():|
shell.switchTab( shell.openTab("falling") )