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Hello Jrjperu and welcome to XOOPS forums
. Don't worry about your English, hey at least you make an effort! Well done to you
Now about Gcards, well they are similar to e-cards that we all know about. There is no module that produces this directly, but xcgal gallery module will produce ecards from pictures uploaded. You could also use and iframe module like this
HERE and place this URL
HERE in the iframe.
Good luck, and post back if you need any further help
Regards Richard