I found one site, it may help you and I.
Autodesk MAXScript Reference 9http://www.kxcad.net/autodesk/Autodesk_MAXScript_Reference_9/index.htm
Autodesk MAXScript Reference in 3DS MAX 4http://www.zipsites.ru/books/3ds_max_4_maxscript_reference/or download the PDF file directly: http://files.zipsites.ru/books/graphics/maxscript.rar
Why 3DS MAX 4 ? Because its MAXScript Reference may can applicate into GMAX v1.2. Just try!If it's wrong, please response me quickly. Thanks.