The selectability of function can be applied to any object. The value returned by ESL is the boolean (true or false) associated with the selectability of the specified object. If the object is selectable, the value true is returned; if it is not selectable, the value false is returned. For example, if you define a key:

key Hold at position 100 100

and then later specify in your program the function

selectability of Hold

ESL returns the value true.