2.In case investing in dollars and intends converting in rupees than one must keep an eye on appreciating rupee.
3.One has say invested in dollars for a year and dollar appreciates by 15% and here rupee also strengthens by say 10% then net effective gain is only 5% as dollar gain has been offset due to strengthening of Indian rupee.
4.So one must trade in Forex if one can keep track of these market 24 hours and must analyse the effect of particular currency against dollar etc.