CITRIX isn't a Window Manager.
It looks like Gnome2 is the default WM for RHEL 5.8 but I can't find anything that explicitly states that.
Gnome2/Mate (Metacity/Marco):
System -> Preferences -> Keyboard shortcuts
Set the shortcut for Move between windows, using a popup window (default is Alt+Tab
). It's possible you are using Compiz
or another WM though, so figure that out.

However, noticed you mentioned konsole
, the official KDE terminal emulator. This suggests you may be using KDE
. To switch tabs in konsole
the default is Shift+RightArrow or change it Settings -> Configure shortcuts -> Next Tab
.

To switch windows in KDE Alt+Tab
or change it System Settings -> Window Behavior -> Task Switcher -> All windows

Alt + Tab
should work in nearly any WM. But theAlt
is an escape-char for CITRIX imho. Just Change the Shortcut to something else like shown in the answer from justbrowsing – xx4h Aug 13 at 5:14