If you have FileMaker 11, you can use a global variable. Global variables can be enclosed in merge brackets << >> just like a merge field. Use a script with a set variable step to put the value into the field or use a conditional format expression that uses a Let function to assign a value to the variable.
If you don't have FileMaker 11, you can still do this, but use a field with global storage and it will still display the value while in find mode.
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