Soft Label Key functions (slk_...)

[Bob Daniel]

I have a function to set key labels for fkeys but am attempting to
find out what a label already contains.  According to my manual,
slk_label(label_number) will return the contents of label_number.  I
am not able to get it to return the contents.

slk_init() needs to be called before using slk_label() but it appears
to wipe out the contents of the label.   Is there a way to get the 
label contents before init'ing them?