Let me explain you step by step.

First, i show all the list software from the SOFTWARE table in order to assign it to a computer (in example, the computer code has assigned the software: Windows 2000, office 97, etc. all this it's for to have an inventory of the software in every pc), and i select the software to assign and after that i save the information in the table SOFTASG where i place the code of the pc and the software i choosed before.

Obviously, if i call again the pc code i don't wanna show all the software list but the software i haven't assigned to the pc.

i don't know if i explained this correctly, just let me know i don't.

Thanks