They could use the search function and find the answer. 

The likelihood of all of these occurring is low in a typical subject-to transaction. its why way back in our day we did these with wraps CA has a debt instrument called an All inclusive Deed of Trust it wraps the orginal mortgage it is a second in function my dad had a company called CA wrap back in the day and did hundreds of them.. its de ja vu all over again.. he did this during the Carter interest rate spikes just like sub too is now coming to light in a big way because of interest rate spikes.. 

No servicing function yet but the loan origination and CRM are pretty darn good!

Most property management software should have this function. 

Use the lookup function.

The ONLY advantage us "meat sacks" have right now is form, we have more optimized form for function. 

Once you have a shortlist, sign up for an account with each one and test them extensively to see how they function.

My biggest tip I learned – Use the “search” function (the magnifying glass next to your profile icon) to search for your question BEFORE posting it on the forum.

Once you have a short list, get an account with each one and run them through the wringer to see how they really function.

Simpler, easier, and still functional.