1.
Talk to SAP with JCohttp://searchsap.techtarget.com/tip/1,289483,sid21_gci854012,00.html2.
SAP JCo Functionshttp://help.sap.com/saphelp_webas630/helpdata/en/09/a4a9e1d51d11d6b2c200508b5d5c51/frameset.htm3. JCO Class
http://www.huihoo.org/openweb/jco_api/index.htmlFor Advantages/Dis-advantages of JCO.
See this pdf. It's very good.
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/com.sap.km.cm.docs/library/ep/_s-u/SAP%20Java%20Connector%20(JCo)%20Presentation.pdf
(Copy & Paste the url).
4。JCO Cook Bookhttp://searchsap.techtarget.com/generic/0,295582,sid21_gci1119574,00.html?bucket=ETAI assume that web services means that services that are provided by the Web Application Server.
In WAS Server there are 2 stacks. viz., ABAP Stack and JAVA Stack.
The Communication between these two stacks is only using the JCO.
Refer this link from help.sap.com....
http://help.sap.com/saphelp_erp2005/helpdata/en/e1/b5443e02a9ab4186a6e1240a9a2455/frameset.htmFor your information there is something called BSP which is similar to JSP or ASP where
you can have both abap & java scripts in BSP documents.(Business Server Pages).
Refer this link...
http://www.thespot4sap.com/Articles/SAP_WAS_Overview.asp(Click 'Next' Button in this site to explore more).
JCO vs JCO Wrappers.
http://www.riess.de/EN/center/pdfs/Datenblaetter/rae-p02-jcow-050302.pdfRefer Conclusion on this page.
http://www.thespot4sap.com/Articles/SAP_Netweaver_Advantages_and_Conclusion.asp