TFT Arduino Mega 2560

Hi, sorry for my english, im from Argentina.

I have a question, is possible upload on the runtime an sketch? Maybe for tftp or browser like router (upload new firmware).
I found information about arduino uno, like some bootloader but for arduino mega 2560 i cant found anything.

Thanks !!!
(Sorry again, im strong in spanish :P)

Hello, I am interested also to loading the sketch from the network, with Arduino Mega.
Were you able to upload it and make it work?
thanks