khotkeys

[serja <mekoc@inbox.ru>]

I have genius multimedia keyboard and I've setup the extra keys with the small 
script, which is executed automatically when I start KDE.
After that I've made some keybindings in Kcontrol for some applications like 
Kmail, Firefox, etc.
My problem is that if I occasionally press this keys for a longer period of 
time it execute as much copies of a choosed program as it can. Can I limit 
the number of running applications at the same time (for example only one 
Kmail, Firefox, etc.), to avoid the effect described above, or maybe there is 
some other solution?
Thanks in advance!