Eden-DAoC

Hi,
I'm using the recorder and i have a problem with the sendkey function.
I want to do a heal recorded ability that 1) target me 2) cast a heal 3 ) select my last attacker
For me target last attacker is bind to the key F10
so i write
/recorder start
/target Enarion
i choose the heal i want to cast here
/recorder sendkey F10
/recorded save heal_me

When i use the recorded ability it do all the others commands but it didn't select my last attacker at the end ( neither give me the error message that say that my last attacker is not in range )
If i map last attacker to the touch P ( or any touch A..Z ) it work.
Is there a special character to use with sendkey when it is a function key that you want to send ? or is has to be only an A to Z key no function or special key ?

as far as i have tested, no special keys working for recorder, also no ctrl or alt combos, and for sure nothing like shift-tab

In the Wiki, under Slash Commands, it list /recorder. Expanding, one of the lines is:
/recorder sendkey <key> : Send specific key to the game client (ie: F, Space, etc)

Question: What is the syntax to send a non-alphabetic key, such as space? Is there an escape key for special characters?