Installing reverse proxy and web dispatcher

I have come across a requirement for configuration of Reverse proxy & web dispatcher... to be installed on separate servers.
Can you help me know if SAP Web Dispatcher can run as a standalone component or will I have to install NW and then, install the SAR file. If we need NW, should I go for AS ABAP / JAVA... I believe it would be ABAP as we are using SAR file and not an SCA. Although, I wonder if my Web Dispatcher needs a database as I dont see any functional use of the database ?
How about reverse proxy.. Would it be good to go with IIS or with Apache.. Any other alternatives that you know of ?
I have been using Windows 2008 server & DB2 UDB.
Thanks,

Hi,
Please see the link below about the reverse proxy..
https://cw.sdn.sap.com/cw/docs/DOC-115672
For 'Dispatcher run as a standalone component' see the link below..
http://help.sap.com/saphelp_nwmobile71/helpdata/en/bc/0e774258449041e10000000a1550b0/content.htm
http://tleterme.developpez.com/bw/how/HowToWebDispatcher.pdf
Regards
Bhuban

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