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system folders, screen sizes and mactcp questions

I was wondering if anyone out there can help me with the following

I have written a system that needs to know where the system folder is. I
have done this for system 7 machines (using gestalt) but I need to do it
on 6.0.X machines as well. Can someone show me how to do this? Also how
do I check for the current system version?

I need to find out the sizes of the screens attached to the Mac running
my application (all screens if more than one).

I am using MacTCP (version 1.1) and the fixed MacTCP.lisp interface. 
After I open and close about 10 tcp streams I get the following error:

> Error: Error #-23048
> While executing: CCL::TCP-HOST-ADDRESS
> Type Command-. to abort.
See the RestartsI menu item for further choices.

Thanks VERY much for any assistance offered.

|Curt Stevens   (303) 492-1218 | / |arpa:stevens@sigi.cs.colorado.edu  |
|Univ. of Colorado, Boulder    |o o|uucp:ncar!sigi.cs.colordo.edu!{...}|
|Computer Sci. Dept. ECOT 7-7  | | |-----------------------------------|
|Campus Box 430                |\_/| I contradict myself? Very well, I |
|Boulder, Colorado 80309  USA  |   | contradict myself. - Walt Whitman |