Hi Robert,
In my update forms, I use a source function to return a description which is shown on the tab.
Like e.g. 'Insert record', 'Edit record' etc..
I put the function name in the tab heading. The argument I put in the function call is loc:act.
Because when the app is running, the tab allways shows me the right "file action" (as I call it), I presume the place where the function is executed, is the right place to look for the value of loc:act.
Name your tab 'Humpty dumpty' and check the source for this "frase".
When you find it you have also found the place to check out the true value of loc:act you need.
Cheers,
Rene