Can I register webdispatcher and saprouter in SLD?

Question

We've fronted all our systems (abap or java or both) with a webdispatcher.
Is there any way to (preferrably automatic) register these webdispatchers in SLD.
Our developers are starting to use SLD as a data source for connection info,
but all our systems are firewall protected.  Same question but regarding saprouter.
I would also need some way to tell applications using SLD for connection info to employ these filtering tools rather than direct connections.
Ken

Answer 1

This one needs some explaination!
I normally code:
rdisp/mshost = sap_backend_host
ms/http_port = 81##
This is replaced by
wdisp/system_0 = HOST=sap_backend_host, PORT=81##, SID=SAP_BACKEND_SID, NR=<sap backend instance name, eg SCS##>
Excerpt from dev_webdisp_watchdog trace file:
[Thr 47319736972384] *** WARNING => Both wdisp/system_0 and rdisp/mshost,ms/http(s)_port specified. Ignore rdisp/mshost, ms/http(s)_port. [icrxx_mt.c   1245]
[Thr 47319736972384] *** WARNING => IcmParseSubParam: unknown subparam "HOST" for parameter: HOST=sap_backend_host, PORT=81##, SID=AAA, NR=SCS## [icxxpara_mt. 429]
[Thr 47319736972384] *** WARNING => IcmParseSubParam: unknown subparam "PORT" for parameter: HOST=sap_backend_host, PORT=81##, SID=AAA, NR=SCS## [icxxpara_mt. 429]
[Thr 47319736972384] *** ERROR => no host/port set in wdisp/system_0 [icrxx_mt.c   1312]
Apparently Web Dispatcher didn't like my interpretation of the documentation.  And it didn't barf where I thought it would (NR suggests NumbeR, so maybe ## but the doc says msg server instance NAME)
Note: I didn't actually code ##, rather I inserted msg server instance number.
If one gets this form of defining the backend web dispatched system working, does startsapsrv then call the backend requesting it register in SLD?  I don't see any SLD connection info.
Ken