mark serial as used?

[EaterOfDog]

I have two databases. One is a database of software types and serial numbers we own. The other is a database of computers we own. The computer database creates a value list from the serial numbers in the software database, to assign serial numbers to computers. How can I make the software database click a checkbox to show the serial number was used in the computer database? This would let me quickly scan for available serial numbers. Thanks!

FileMaker Version: 5

Platform: Mac OS 9

[Ender]

In Software: Used=not isempty(Computer::SW_Serial#)

where the relationship between Software and Computer is Software::License ID=Computer::SW_Serial#

Many volume licenses (like FileMaker) use the same code for all computers. To take this into account, you may instead find it useful to do a count instead:

Used Count=Count(Computer::SW_Serial#)