On checking your work you discover that you need to make the following alterations: (i) SLOO1 Change Credit Limit to £9000 (ii) SLO02 Change post code to BS24 4TY (iii) SLO03 Change contact name to Julian Werrett When making these changes select Customer Details and at the prompt for Account Ref press F4. This will list all the accounts that currently exist in the sales/purchase ledger. To select an account use the arrow keys to position the cursor and press enter. The F4 key is a very useful quick search facility that you will use frequently. When large volumes of data are held on the system you will know the name of the account you wish to access but not always its reference number. The F4 key will speed up access to the relevant account.