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Excel Object Model: Application.ActivateMicrosoftApp

application.activateMicrosoftApp activates or starts (another) Office application, for example MS Word: 
application.activateMicrosoftApp xlMicrosoftWord
The constants that are accepted by this method are the values of the xmisApplication enumeration:
xlMicrosoftAccess 4
xlMicrosoftFoxPro 5
xlMicrosoftMail 3
xlMicrosoftPowerPoint 2
xlMicrosoftProject 6
xlMicrosoftSchedulePlus 7
xlMicrosoftWord 1

See also

The function get-msOfficeComObject of the PowerShell module MS-Office.
The Application object

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