If you look at the root directory where BootIt NG is installed, you will see several BOOTITNG.*, EMBR*.*, BOOTIT*.SND and *.MNU files. You will also see BOOTITMB.DAT and CURRENT.GRP files, as well as the directory \BOOTIT in all Multi-OS partitions.
If BootIt NG is installed to a visible/shared partition, you can hide the BOOTITNG files if you would like (attrib +h bootitng.*, attrib +h bootit*.snd, attrib +h *.mnu). Note: The first time you update a file (such as a boot menu) it will be unhidden.