timeout to NTD winform

Question

hello i write a simple winform app to test the NTD(no-touch deployment) feature of dot net,after deploy it to the iis server,it works well,i can invoke it from either commandline or ie browser. but i found that after it is started up ,i IGNORE it,that means i don't operate it,after a wile,it is automatically closed.why,are there some .net configuration to incharge the timeout? how can i make the winform app that start from the GAC keep PERMANENTLY running in the client side,even no body touch it. thank you!!