Inter-letter spacing

[info]

 Hi there,

 after gaining some experience with Latex and groff I am curious about Lout. At
 first glance it looks very promising to me. I just stumbled about the issue of
 adjusting the inter-letter spacing of words. How is this done in Lout? 
 Basically, I want some characters to overlap and some to have larger then
 normal spacings within one word.

 Thanks in advance,
 Martin