[lemma=the] [word=servers] [□] □
[lemma=the] [word=servers] [□=□] □
[lemma=the] [word=servers] [□ & □] □
There are also customization systems that do not use proxies per se , but rather use more general mobile code mechanisms to support remote processing at arbitrary hosts , typically at the servers themselves [ 18 , 21 ] .