Exhibit 4.11 STOCK PURCHASE AGREEMENT THIS STOCK PURCHASE AGREEMENT (this "AGREEMENT") is made as of July 31, 1998, between AppNet Systems, Inc., a Delaware corporation (the "CORPORATION") and Barbara Barnes (the "EMPLOYEE"). The Company and Employee...Stock Purchase Agreement • July 15th, 1999 • Appnet Systems Inc • Services-business services, nec • Maryland
Exhibit 4.13 STOCK PURCHASE AGREEMENT THIS STOCK PURCHASE AGREEMENT (this "AGREEMENT") is made as of August 12, 1998, between AppNet Systems, Inc., a Delaware corporation (the "CORPORATION") and Robert George (the "EMPLOYEE"). The Company and Employee...Stock Purchase Agreement • July 15th, 1999 • Appnet Systems Inc • Services-business services, nec • Maryland
Exhibit 4.10 SENIOR MANAGEMENT AGREEMENT THIS SENIOR MANAGEMENT AGREEMENT (this "AGREEMENT") is made as of November 2, 1998, between AppNet Systems, Inc., a Delaware corporation (the "COMPANY") and Anne Filippone (the "EXECUTIVE"). The Company and...Senior Management Agreement • July 15th, 1999 • Appnet Systems Inc • Services-business services, nec • Maryland
Exhibit 4.9 SENIOR MANAGEMENT AGREEMENT THIS SENIOR MANAGEMENT AGREEMENT (this "AGREEMENT") is made as of July 31, 1998, between AppNet Systems, Inc., a Delaware corporation (the "CORPORATION") and Toby Tobaccowala (the "EXECUTIVE"). The Company and...Senior Management Agreement • July 15th, 1999 • Appnet Systems Inc • Services-business services, nec • Maryland
