HeapLocker allows you to set a maximum to the amount of private virtual memory a process is using. If the maximum is exceeded, the process will suspend the process and inform the user. The user can decide to terminate the process, or decide to continue using the program. For applications that (mostly) just display data, like Adobe Reader and Internet Explorer, this is not a real issue, because no data is lost when you terminate the application. With Microsoft Word or Excel, you will loose unsaved data when the process is terminated.”]
Source: https://blog.didierstevens.com/2010/12/14/heaplocker-private-memory-usage-monitoring/