Apache2: serve page from another IP address

Apache2: serve page from another IP address

Please bear with me while I try to explain some htaccess gymnastics I'd
like to perform...
I have the following domain:
eamorr.somesite.com (192.168.100.100)
It is serving pages from my 'public_html' folder as expected.
Now, I want to use the following address:
www.somesite.com/eamorr
I do not have control over www.somesite.com (192.168.99.99), however my
sysadmin has allowed me to place a .htaccess file in the 'eamorr' folder.
I am not allowed, under any circumstances, to place anything else in the
'eamorr' folder for reasons I do not know.
What I want to happen is this:
User navigates to www.somesite.com/eamorr/some_page.php
User is fed some_page.php from eamorr.somesite.com/some_page.php (i.e.
192.168.100.100/some_page.php).
I'd like this to be as seamless as possible -- i.e. when a user navigates
to http://www.somesite.com/eamorr/some_page.php they get served
some_page.php and are oblivious to the fact that some_page is coming from
a different server (192.168.100.100)
http://www.somesite.com/eamorr should be in the address bar of the user's
browser at all times and not http://eamorr.somesite.com -- my boss "just
wants it that way"...
Is this possible to do using .htaccess?