Citrix XenApp (TM) is a Windows (R) application delivery system that manages
applications in the datacenter and delivers them as an on-demand
service to users anywhere using any device. XenApp reduces the cost
of application management by up to 50 percent, delivers any application
instantly to users anywhere and improves application and data
security.

you can copy the certificate to /usr/ports/distfiles and add the
following line to your /etc/make.conf:

	ICA_CERTS=mycert.crt

It will then automatically be installed and removed with the normal
FreeBSD package tools.

WWW: http://www.citrix.com/English/ps2/products/product.asp?contentID=186