[R-SIG-Mac] Get a list of valid parameter arguments for given function

[Hans-Jörg Bibiko]

Hi,

is there a built-in way to get a list of valid parameter arguments  
for a given function?

Examples:

for the function 'dist' > parameter 'method':
"euclidean", "maximum", "manhattan", "canberra", "binary", or  
"minkowski"

for the function 'format' > parameter 'justify':
"left", "right", "centre", or "none"

Thanks for any hint,

Hans