In article .com,
wrote:

Jacque wrote:
The hole might function as a drain, to allow condensed moisture to
escape. How big a hole is it?

About half an inch in diameter. They're closer to the sides of the
window frame than the center where each window overlaps.

One possibility is that a previous occupant was a radio amateur and ran
a coax cable out that hole to an antenna. 1/2 inch would fit the most
commonly used coax size.

--
Rich Greenberg N Ft Myers, FL, USA richgr atsign panix.com + 1 239 543 1353
Eastern time. N6LRT I speak for myself & my dogs only. VM'er since CP-67
Canines:Val, Red, Shasta & Casey (RIP), Red & Zero, Siberians Owner:Chinook-L
Retired at the beach Asst Owner:Sibernet-L