Nick,

You have to be careful when using timers, if the VFP timer is implemented using Win32 then that timer is not guaranteed to fire on the intervals you define, in fact several WM_TIMER messages can be combined into one before they hit your threads input queue.

This of course depends on VFP's implementation of the native Timer control, it could be that they handle all this in a fashion more typical of a high resolution timer? Just a heads up.

Regards
Neil