[DUG]Timers

[John Bird]

If I have two timers active in a program, and occasionally one of them takes
a while to execute its code, does it hold up the other timer from firing
until it is done?

Or phrased another way can I think of two timers as if running in separate
threads, or in the same thread, so that one finishes before the other can
get a chance to run.

The reason I am wondering is if there are any issues to be careful of in
modifying variables shared between the two timers.

John