Ernie, I do not believe for a second that any security company seeing house prewired for security would not use said wiring and instead insist on a wireless solution.

Second, security signal is not susceptible to EMI noise as is A/V wiring. As such, you'll see small gauge 22/2 and 22/4 wires ran in same chases as romex, which not only 'protects' wire from insulators and dryeallers, but also saves installation time by using stud & top plate holes already drilled by sparky.

Lastly, depending on how you count your wires, 5 windows in a room could count as 5 separate runs, even though they are daisy chained from window to window.