If you cannot invoke khoros tools like putimage, preview or the runwksp 
when clicking at special hyperlinks, follow the instructions below:

Create a file called ".mime.types" in your home directory with the following 
contents:
application/animate             kdfa
application/cantata             wk
application/editimage           kdfe
application/editcmap            kdfc
application/putplot2            kdf2
application/putplot3            kdf3
application/xprism              kdfx
application/putimage            kdf
application/preview             pane form

and create a file called ".mailcap" in your home directory with the following
contents:
application/animate; animate -i %s
application/cantata; runwksp -wksp %s
application/editimage; editimage -i %s
application/editcmap; edicmap -i %s
application/putimage; putimage -i %s
application/putplot2; putplot2 -i %s
application/putplot3; putplot3 -i %s
application/xprism; xprism -i1 %s
application/preview;  preview -i %s -noform

Also, make sure the $KHOROS_HOME/bin is in your path.