hi,
I added something to the FAQ's yesterday.
You can set up express Invoice/Accounts to be accessible to a number of contributors by using Web Access.
Go into 'Tools' > 'Options'> 'Web Access' and check the box to enable Web Access. Then go to the next tab 'Web Accounts'
Click Add, set up the user as you want them and press ok. These people can access the web version via the address on the Web Access tab
e.g. http://192.168.1.100:98/ On this page they will be asked for their email address and Password to log in.