First of all, thanks Jal for helping me out with the issues i had regarding other topics.

The following screen has some buttons for adding applications to one or more employees. I need to programm the following two buttons with the green squares.

All the listboxes are multiselect.

Listbox leftup: List_ExtraApps
Values: tbl_Application.[Application name], tbl_Application.[Application description], tbl_Application.[Application version], tbl_Application.Applicationcode

Listbox rightup: List_EmpExtApps
Values:tbl_Employee.Username, tbl_Employee.[Employee First Name], tbl_Employee.[Employee Middle Name], tbl_Employee.[Employee Last Name], tbl_Employee.[Business Unit]

Listbox downleft: List_SelectedApps
Must have the same values as selected in List_ExtraApps.

Listbox downright:List_SelectedEmployees
Must have the same values as selected in List_EmpExtApps

Select Application: btn_SelectApplication
OnClick event must be programmed. OnClick all the selected application need to be visible in other listbox.

Select Employee: btn_SelectEmployee
OnClick event must be programmed. OnClick all the selected application need to be visible in other listbox.

http://i40.tinypic.com/nla3b9.jpg