Rational DOORS 9.3 is supported on Citrix XenApp 5.0 (Advanced) on Windows 2003 Server Standard and Enterprise Edition (32 bit and 64 bit) and Windows 2008 Server Standard and Enterprise Edition (32 bit and 64 bit), using the Citrix ICA client v 10.00.52110 on Windows XP.
Although it might be possible for Rational DOORS 9.3 to work with other versions of Citrix on other supported Rational DOORS platforms, they have not been tested and are not supported.