[THIN] Re: what goes down an ICA pipe??

  • From: "Braebaum, Neil" <Neil.Braebaum@xxxxxxxxxxxxxxxxx>
  • To: <thin@xxxxxxxxxxxxx>
  • Date: Wed, 14 Jan 2004 10:17:01 -0000

I'm not convinced there's much in the way of instructions sent over ICA
- I figure it's more in the way of regions, or partials.

Historically, this was why ICA was better / lighter / faster (said in a
Six Million Dollar man kinda way) than RDP over a wan (ICA was - dunno
if still true, but I've got no reason to doubt it, and the logic still
sounds likely - much better at partial screen updates than RDP, but the
difference wasn't so clear or obvious with full screen updates - and
normal usage will probably tend towards a warm, cosy blend of the two),
but why the difference wasn't so obvious, or clear (depending on
application / desktop usage) at LAN speeds.


> -----Original Message-----
> From: Angus Macdonald [mailto:Angus.Macdonald@xxxxxxxxxxxxxxxxxxx] 
> Sent: 14 January 2004 09:28
> To: thin@xxxxxxxxxxxxx
> Subject: [THIN] Re: what goes down an ICA pipe??
> VNC sends bitmaps down and it's vastly slower than ICA. I'm 
> sure ICA must send GDI commands, some of which will naturally 
> be bitmaps.
> -----Original Message-----
> From: Brian Lilley [mailto:Brian.Lilley@xxxxxxxxxxxxx]
> Sent: 14 January 2004 09:23
> To: 'thin@xxxxxxxxxxxxx'
> Subject: [THIN] Re: what goes down an ICA pipe??
> Thanks Neil,
> I was wondering how smart ICA is, i.e. I guess it isn't 
> simply sending bit changes, but instead using some kind of 
> x'like instruction set to at least provide pattern 
> repeating/windowing functions?
> Cheers, Brian
> -----Original Message-----
> From: Braebaum, Neil [mailto:Neil.Braebaum@xxxxxxxxxxxxxxxxx]
> Sent: 13 January 2004 17:22
> To: thin@xxxxxxxxxxxxx
> Subject: [THIN] Re: what goes down an ICA pipe??
> Your synopsis is about on the money.
> ICA sends partial and full screen updates, X sends 
> instructions (as a very rough and ready comparison).
> Neil
> > -----Original Message-----
> > From: Brian Lilley [mailto:Brian.Lilley@xxxxxxxxxxxxx]
> > Sent: 13 January 2004 16:38
> > To: 'thin@xxxxxxxxxxxxx'
> > Subject: [THIN] what goes down an ICA pipe??
> > 
> > Chaps, I have heard several people describe the ICA
> > connection as the windows answer to X.  I personally don't 
> > think this is correct as I understood that the ICA session is 
> > simply sending bitmap screen changes as opposed to X which I 
> > understand sends screen drawing commands??  
> > 
> > Any help much appreciated as usual...

This e-mail and its attachments are confidential
and are intended for the above named recipient
only. If this has come to you in error, please 
notify the sender immediately and delete this 
e-mail from your system.
You must take no action based on this, nor must 
you copy or disclose it or any part of its contents 
to any person or organisation.
Statements and opinions contained in this email may 
not necessarily represent those of Littlewoods.
Please note that e-mail communications may be monitored.
The registered office of Littlewoods Limited and its
subsidiaries is 100 Old Hall Street, Liverpool, L70 1AB.
Registered number of Littlewoods Limited is 262152.

This Week's Sponsor - RTO Software / TScale
What's keeping you from getting more from your terminal servers? Did you
know, in most cases, CPU Utilization IS NOT the single biggest constraint to
scaling up?! Get this free white paper to understand the real constraints &
how to overcome them. SAVE MONEY by scaling-up rather than buying more
servers. http://www.rtosoft.com/Enter.asp?ID=147
Useful Thin Client Computing Links are available at:
For Archives, to Unsubscribe, Subscribe or 
set Digest or Vacation mode use the below link:

Other related posts: