How can I stop while loop of sub VI from front panel

[I_I]

Please Refer attached VIs for description.

I have two VIs, one is main_1.vi and other is main_2.vi. I am calling main_2.vi from main_main_1.vi. How can I control while loop in main_2.vi from main_1.vi.

Please anybody can guide me sort out this question.

[I_I]

One more VI as

[ian_fung]

Hi,

You may use VI Server to accomplish that task.
Take a look at this thread

However, may I ask what is the main2 (subVI)doing?
Why do you need to have a while loop in it, and control from the main1 vi?

Regards,