Copy between windows

[tnas]

Hello folks,

I'm a begginer in the use of the vi, and I have a bit question: How can 
I copy a text between differents windows ?

Thanks in advance.

--
Thiago Nascimento
#!/usr/bin/perl
$_="tMM naaCt Feocmama_itpUilucoGa";$_.=$1,print $2 while s/(..)(.)//;print 
substr$_,1,1;