Preheat oven to 350 deg. Line cookie sheets with parchment paper or grease them. On piece of waxed paper, combine flour, baking powder and salt. In lg. bowl, cream butter with an elec. mixer, add sugar and beat until fluffy. Beat in eggs and vanilla, the n add melted choc. and beat well. Add flour mixture, mixing until smooth, then stir in the coconut, chopped pecans, and choc. chips. Drop dough from a teaspoon onto prepared cookie sheets, leaving about 2 inches between each cookie. Press pecan half on t op of each cookie. Bake on rack in middle of oven for 10 to 13 mins., or until set. Transfer cookies to wire racks to cool. Store in airtight containers for up to 1 week or in the freezer for up to 2 months.