A DDE callback function receives this transaction when a critical error occurs.
wFmt
Not used.
hConv
Identifies the conversation associated with the error. This parameter is NULL if the error is not associated with a conversation.
hsz1
Not used.
hsz2
Not used.
hData
Not used.
dwData1
Specifies the error code in the low-order word. Currently, only the following error code is supported:
| Error Code | Description |
| DMLERR_LOW_MEMORY | Memory is low—advise, poke, or execute data may be lost, or the system may fail. |
dwData2
Not used.
An application cannot block this transaction type; the CBR_BLOCK return code is ignored. The DDEML attempts to free memory by removing non-critical resources. An application that has blocked conversations should unblock them.