Controlling Mathematica Through the MS-DOS Command Line in VBA for CST MWS

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LowerySj
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Hi, guys. I need to control Mathematica through the MS-DOS command line in Visual Basic for Applications as part of a macro for CST Microwave Studio. I can call Mathematica through the command line just fine with

Code: 
Shell("math", vbNormalFocus)

but when I try to enter commands afterward, such as

Code: 
Shell ("1+1", vbNormalFocus)

then VBA interprets this as me wanting to open another command line box instead of using the one I just opened and which has the Mathematica interface up. I've searched the internet for a few hours trying to fix this with no luck, so I thought I'd ask you guys. It seems like if I just knew one or two more lines of code I could fix this. Any help would be greatly appreciated.

On a side note: the variety of VBA that CST's macro system uses is WinWrap Basic.
 
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Sending commands one after the other will never work.

Generally speaking (not sure this would work with Mathematica in particular) is to generate a script file containing all the commands one wants an external program to perform, then open a shell executing the program with input from the script file.