Some customers have reported that they would not like to launch the application corresponding to certain writer component when they run their protocol, in which some writer components are included, in Insight for Excel.
In this case, you can prevent Insight for Excel from launching application by sending keys "Alt" and "F4".
To do this, add VBScript (on Client) component after each writer component and write following script in Script parameter.

SendKeys "%{F4}"

To be precise, this solution does not prevent from launching application corresponding to writer component but closing its application in a second.