http://www.flyertalk.com/forum/27431474-post24.html.. tells you how to find the transfer desk.

There they will direct you to apron transport to T3 (there might be a wait).

At T3 they will process your documents, then set you free into the airside departure area.

It's a well practised system; you really dont't have to do anything special, just follow signs and instructions.

And, yes, I've done it.


This post from some idiot might help further http://www.flyertalk.com/forum/25421541-post4.html

The point to remember is that Cairo is a major international airport: transfers are routine. Officials are generally helpful and certainly know what they're doing. The place and the process might appear chaotic, a bit of a shambles, but it works.