[MSDN Library April 2000] UILevel Property (Installer object) (79.0756302521008%)
MSDN Library - April 2000 > Platform SDK > Management Services > Setup > Windows Installer > Automation Interface > Automation Interface Reference > Installer Object
[MSDN Library April 2000] UILevel Property (36.25%)
MSDN Library - April 2000 > Platform SDK > Management Services > Setup > Windows Installer > Properties > Property Reference