Personal Communications Response

If Personal Communications can perform the Set Session Advise Condition function, Personal Communications returns this ACK message:
WM_DDE_ACK(wStatus, aPSCOND)

If Personal Communications cannot perform the Set Session Advise Condition function, then Personal Communications returns an negative ACK message containing one of the following return codes in the low-order byte of wStatus:

Return Code Explanation
1 Advise is already active.
2 Advise condition is already active.
3 PS position is not valid.
4 String length is not valid.
6 The specified format is not valid.
9 A system error occurred.