Understand takes about 100-200MB of installation space, depending on which OS it is installed on and will run on Windows (XP SP3 and later), Linux, Solaris (Sparc and Intel) and OSX(Intel). It will run on just about any system. However, for larger code bases the more RAM the better. We recommend 1GB / Million lines of code, it will run on less, but it is much slower.
You can reset Understand to its initial Settings by exiting the program and then renaming or deleting the configuration file. On Windows you may have to enable “Show Hidden Files and Folders” first. The configuration file can be found in the following location:
Build 512 and Later
Windows 2000/XP - C:\Documents and Settings\USERID\Application Data\SciTools\Understand.ini
Windows Vista/7 - C:\Users\USERID\AppData\Roaming\SciTools\Understand.ini
Linux/Unix - ~/.config/SciTools/Understand.conf
Mac OS X - ~/Library/Preferences/com.scitools.Understand.plist
Build 511 and Earlier
Windows 2000/XP - C:\Documents and Settings\USERID\Application Data\Scientific Toolworks, Inc\Understand.ini
Windows Vista/7 - C:\Users\USERID\AppData\Roaming\Scientific Toolworks, Inc\Understand.ini
Yes you can. Most platforms have a 64bit specific build, but the 32bit Understand should run fine on all 64bit Operating Systems as well.
On Linux/Unix you will probably need to install your system's 32-bit compatibility libraries.
On Debian based systems (including Ubuntu) the IA32 package will provide everything you need. The command sudo apt-get install ia-32-libs should be all you need to run. Then Understand should launch with no problems.
I don't have a Redhat/Fedora 64bit machine to test this on, but from what I've read the following commands will install the necessary libraries.
I actually couldn't find much information about running 32bit apps on Fedora or Redhat other than this forum post. If you know or find a better way to do this, let me know and I will update these instructions.