To install new solution files, use the “STSADM -o addsolution” command. After you have installed the solution you need to deploy it to web applications for the content to be available. To do so, use the “STSADM -o deploysolution” command.
Type any of these commands in a command console to see other parameters.
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Posted under Administrator

If you add new files to a solution, remember that a solution upgrade does not deploy new files, only update existing files. You need to uninstall and reinstall the solution to add new files.
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Posted under Developer

WSP and STP files are just .cab files in disguise. Rename them to .cab and you can open them with a zip tool and extract the contents. You can then make edits and repackage to modify a template file.
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Posted under Developer

You can activate features through code by adding the GUID of the feature to the SPWeb, SPSite, or SPWebApplication object. You can also check if a feature is activated by checking the Features collection for the same GUID value:
Guid g = new Guid(”d2b48bc4-9d29-4090-960c-79c2852cfd65″);
if (web.Features[g] == null) web.Features.Add(g);
To activate features on the Farm level you must [...]

Posted under Developer