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                MICROTIMER function 
                The MICROTIMER function is a wrapper function for the Windows high-resolution timer API. 
                The function returns a double containing seconds. The resolution of the timer is dependent on the clock speed of your PC, but is about 1 microsecond on a 1200MHZ AMD. The function itself takes about 5 microseconds to execute when called from VBA on the same machine. 
                The function is not volatile, and is primarily designed to be called from VBA Subs/Functions rather than from a worksheet. 
                MICROTIMER Syntax 
                MICROTIMER() 
                MICROTIMER Remarks 
                To call the function from VBA you must first make a reference from the VBE to FastExcelV4: 
                Open the VBE (Alt F11) 
                Open a module within your VBA project 
                Tools->References and check FastExcelV4. 
                It is also possible to evaluate the function from VBA as a worksheet function using Evaluate, but this incurs significant extra overhead. 
                  
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