| IO | Parameter | Type | Description
|
| in | theCADArea | longint | Area ID
|
| in | theLayerOrSubLayerID | longint | Layer ID or Sublayer ID
|
| in | theTypeOfKey | integer | A number between 1 and kCADMaxKeyIndex
|
| out | theKey | longint |
|
| out | function result | OSErr | Error result code, also see Error handling
|