[syslog-ng]directing logs by application

[rich coco]

I am confused by the documentation with respect to the possibility of 
directing
output based on the *name* of an application.

For example, consider 2 legacy applications - appName1 and appName2 -
that historically wrote to syslogd via the LOG_USER facility.

Using syslog-ng, can I redirect each app's log to different files via the
syslog-ng.conf file?

if this is do-able, is the following the correct approach?

    source src { unix-stream("/dev/log"); internal(); };
    destination app1 { file("/var/log/app1.log") };
    destination app2 { file("/var/log/app2.log") };
    filter f_app1 { program("appName1") };
    filter f_app2 { program("appName2") };
    log { source(src); filter(f_app1); destination(app1); };
    log { source(src); filter(f_app2); destination(app2); };

Also, it is not clear to me how i make the program-name (eg, "appName1")
known to syslog-ng in the first place.

Any help/advice welcome. (Oh, Running RH 7.x Linux, to the extent this 
may matter)

Tia,

- rich

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