Indicate on Putty window bar if Putty-window is part of cluster and cluster #

[joriws]

Well title is quite self explanatory..

I just started to test cputty and I'd really like indication if cputty clustering putty windows and perhaps alarm if part of cluster windows are hidden. I mean I forget that I've clustered windows together and bring up on putty and start modifying it forgetting that modifications are going also to another machine..