Okay. I downloaded and ran ProcessExplorer and found the following relevant mutant for a FM12 runtime is
where you replace '<extension>' with the extension you use for your runtime solution files.
My installer now can tell if my runtime is running at the time of an Install or an Uninstall, and abort.
ProcessExplorer can be found here:
To see the mutant for your runtime, select the runtime in the left column and then Ctrl-H to see a Handle Window. Explore that window to find a mutant or two. You'll find the one I noted above.
Thanks ralvy! adding a link to this thread to my resource DB...
Sorry, I have a table inside the Known Bugs List that I use for quick reference purposes to quickly answer questions--whether mine when I develop or those asked here. I maintain links and text based excerpts for quick pasting here or my own use. I've added a link to this thread there.
Anyone that downloads the file can access this information though I haven't put a lot of effort into that layout to make it user friendly--just tried to make it function as fast and efficiently as possible to pull up info that is then copied automatically to the clipboard ready to paste here.