Get(ActiveModifierKeys)
Purpose 
Returns a number representing the keyboard modifier keys (for example, Control+Shift) that are being pressed.
Format 
Get(ActiveModifierKeys)
Parameters 
None
Data type returned 
number
Originated in 
FileMaker Pro 6.0 or earlier
Description 
The number returned is calculated by summing numbers representing each modifier key being pressed. The values assigned to the keys are:
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Command (Mac OS) = 16
Note  For information on how functions evaluate differently on the host versus the client, search the FileMaker Knowledge Base available at http://help.filemaker.com.
Examples 
Returns the number 9 when Shift+Alt is pressed on a computer running Windows.
You could use this function in a script that includes a custom dialog box script step (with an OK and Cancel button) to perform some special action if the user presses the Alt (or Option) key while clicking OK.
Related topics 
Functions reference (category list)
Functions reference (alphabetical list)
About formulas
About functions
Defining calculation fields