What sort of information were you expecting to find? The e-catalogue mainly says what in in PRONI's archives but most of that will not be available online.
There are 2 types of school records- those records which pertain to the building, it's teachers, inspections, etc. and those records which pertain to individual pupils. It's likely the registers for enrolment & attendance that would be of interest to you.
The details from the registers may or may not give you all the information you are looking for. Details included are- name of pupil, date of enrolment, number in register, age in years or date of birth (depending on period), residence (townland or perhaps in towns a street address, religion, father's occupation (not name). Often you will get date of leaving, school transferred to or from.
Once PRONI opens, etc. you may be able to follow up further.
The first thing to do is to check if PRONI have registers covering the period of interest (not all registers have been deposited in PRONI- some are in local custody and others lost).
Is the school still in existence? if so, they may have information. Is there a Facebook page for the school or even Crossmaglen. Someone might have old school photos, etc.
