Since we are constantly adding support for Micro Focus library routines, the best way to get a current list of them is to look in isCOBOL's documentation.
You'll find a "Transitioning from Microfocus" book with a section for "Library routines".
If a library routine you use isn't supported, it's usually easy to write a simple COBOL program to do the same thing using isCOBOL library routines.
If these "wrapper" programs are named the same as the routine, the program's CALL will still work without changing your code.
Also, if you find a library routine you need support for, please let Veryant's support staff know, so we can add it to the next version.