There are NO British Military Records available on-line, except the CWGC. Otherwise, ALL British Army records, including those who fought with King William are kept at KEW, London. (Public Records Office, London) KEW do not undertake private searches of their records, they will advise you to hire a private researcher which could prove costly.
If you are seeking information on LAND GRANTS/HOUSING & WORK given to Military personnel in Ireland, might Isuggest you research the following Landowners.
MARCHIONESS OF DONEGAL. LORD DOWNSHIRE. LORD L'DERRY LORD CLANWILLIAM
Sorry to be so negative, but I do live in England and I am a member of the Society of Genealogist based in London. I know how hard it can be to gain access to our British records! firstname.lastname@example.org