in reply to TK in CGI

Even if it were possible to send a complete application that would render the Tk as a reply, the user would be prompted if she wanted to install such plugin. I remember accepting some years ago such a Tk plugin but I don't remember where and if it was something in PHP. And it worked, at least for that purpose. But, what would have happened if I had to visit that site several times?

I guess that some multimedia player is using the Tk technollogy, but I don't know if there is any way of using it as a tool to load Tk scripts from server-side.

What I understand from your question is that your personal path has reached the time of learning a bit more about server-side applications: persistence, communications, modperl (?), etc. See the Tutorials

Good luck! You are going to enjoy a lot that great side of perl. Then you should compare what you can do with perl and with other similar languages. You are going to conclude that perl is the language for the web. 

.{\('v')/}   C H E E R   U P !
 _`(___)' ___a_l_b_e_r_t_o_________
Wherever I lay my KNOPPIX disk, a new FREE LINUX nation could be established.

In Section Seekers of Perl Wisdom