Send tabs between 2 windows

Download the Tab Options Plugin here:
http://5digits.org/pentadactyl/plugins#tab-options-plugin

Put in

~/.pentadactyl/plugins

Add to your .pentadactylrc

" move tab to window 1 via ctrl+1
map -builtin <C-1> :taba 1<CR>
" move tab to window 2 via ctrl+2
map -builtin <C-2> :taba 2<CR>

This is really useful to me when I have 2 Firefox windows open, one on each monitor. The window number is based on the order the windows are opened. The first window you open is 1, the second is 2, etc..