Kevin Krammer wrote:
> On Thursday 19 February 2009, Maksim Orlovich wrote:
>   
>>>> That's basically impossible for a properly written X application w/o
>>>> wasting tons of memory.
>>>>         
>>> To reconnect, or to make X bloat like that?
>>>       
>> Reconnect, since most of data will be stored in pixmaps, so there is no
>> transparent way of recovering them unless you mirror them on the client,
>> which can easily double memory usage. All the other state will have to be
>> mirrored likewise.
>>     

 Personally I think it would be brilliant if this could happen.  
Apparently it was part of the original "hope" for X

http://www.usenix.org/events/usenix02/tech/freenix/full_papers/gettys/gettys_html/index.html

"You should be able to travel between work and home or between systems 
running X at work and retrieve your running applications (with suitable 
authentication and authorization). You should be able to log out and 
``park'' your applications somewhere until you retrieve them later, 
either on the same display, or somewhere else. You should be able to 
migrate your application's display from a handheld to a wall projector 
(for example, your presentation), and back again. Applications should be 
able to easily survive the loss of the X server (most commonly caused by 
the loss of the underlying TCP connection, when running remotely). "