On the iSeries/AS400 the executables are contained within the Library 'XWARE'. As part of the installation two links are created to these programs in '/QIBM/UserData?/Lotus/Notes/'

To check that these links are created issue the following command :-

'wrklnk obj('/qibm/userdata/lotus/notes')'

Select option 5 'Display'

This should show the 'libsig' and the 'esig' links.