1. An object oriented computing system programmer interface system on a computer platform, comprising: (a) at least one dynamic slot providing asynchronous execution of programmer submitted functions; (b) at least one synchronous timer slot; (c) at least one asynchronous timer slot; (d) at least one exception slot for handling programmer defined system exception callbacks; (e) at least one slot providing external event notification for programmer events; (f) a SESAM dispatcher; (g) a main dispatcher; (h) a SESAM signaling dispatcher; (i) message block memory for storage of message blocks; (j) a list of activity identifiers that return an error when used in waitFor. .. ( ) calls; and (k) an administrator for mapping of the activity identifiers to slot identifiers.