screen uses certain flags to represent windows' status in places like the output of the windows command and the %f string escape. The following flags are currently known:
| Flag | Meaning |
|---|---|
| * | the current window |
| - | the previous window |
| $ | all “logged in” windows (see login) |
| ! | a background window that has received a bell |
| @ | a background window that is being monitored and has had activity occur (see monitor) |
| (L) | a window which has output logging turned on (see log) |
| & | windows occupied by other users (see Multiuser) |
| Z | windows in the zombie state (see zombie) |