Switch beetween Jcos - Possible in coding??

Hi,
I would like to explain my scenario:
I have developed a Web Dynpro Application which has two standard JCo Connections for using RFCs/ BAPIs which are bindend to client 555:
RD_Test and RD_Test_MetaData.
In addion to that I have manually add two other Jcos in Web Dnypro Content Administrator which are binded to client 200:
RD_Test:200 and RD_Test_MetaData:200.
I would like to know if it is possible to switch to another Jco within my coding.
I know it is possible to use sap.wdarfc.useSys in Application Parameter, but this is not the solution, I can use for my scenario.
For example, I must implement something like this:
If (parameter==1){Use Jco 1, Use JcoMetaData1}
If (parameter==2){Use Jco 2, Use JcoMetaData2}
and so on...
Is that possible? And if it is possible, could you give me some coding examples?
Regards,
Frank

It is only possible to switch model data jco at runtime - but it is highly not recommended!

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http://help.sap.com/saphelp_nw04/helpdata/en/f4/651741f163f023e10000000a155106/frameset.htm section <b>sap-wd-arfc-useSys</b>
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