From the left side, just behind the rib cage.
On the left side behind the ribcage.
The left Abdomen
It's not exactly a "window", it's more of a plug, called a capula, that was surgically installed to the outside and the cow's rumen. Basically its for studying the function, chemical, physiological, and biological operations of the cow's rumen, why it does what it does, how it does it, etc. Scienfitic research, is the short answer.
A rumen fistula is a surgically created entry to the rumen in the left flank of the ruminant, typically permanent and with a rubber or similar material device (a 'cannula') fitted to close it between times of use. It enables the rumen contents to be accessed, and the rumen wall to be viewed and biopsied. Surgically modified ruminants such as these are only found on research farms, where they are used to study rumen function. Looking in through the fistula, you can see the rumen contents and the rumen wall.
The rumen.
The rumen.
rumen
It can kill if consumed via the anal passage.
This is exactly what happens when cows get what is called "bloat." A cow that cannot release gases built up in the rumen will die because of the intensifying pressure the rumen puts on the lungs, strangling the cow to death. So to answer your question, the cow would die.
That would be tripe. Tripe is made from the lining of the rumen, the cow's largest forestomach chamber.
A cow has one stomach with four compartments: the rumen, reticulum, omasum, and abomasum. These compartments work together to digest the cow's food.
The animal with seven stomachs is a rumen, such as a cow or sheep. These animals have a specialized stomach compartment called the rumen where food is fermented by microorganisms before being digested further.